Factors of 809,238,528. Calculator of Proper, Improper, Prime and Compound Divisors, if Any

All the factors (divisors) of the number 809,238,528. Connection with the prime factorization of the number

To find all the divisors of the number 809,238,528:

  • 1. Decompose the number into prime factors.
  • See how you can find out how many factors (divisors) the number has, without actually calculating them.
  • 2. Multiply the prime factors in all their unique combinations, that yield different results.

1. Carry out the prime factorization of the number 809,238,528:

The prime factorization of a number: finding the prime numbers that multiply together to make that number.


809,238,528 = 218 × 32 × 73
809,238,528 is not a prime number but a composite one.


  • Prime number: a natural number that is divisible (divided evenly) only by 1 and itself. A prime number has exactly two factors: 1 and the number itself.
  • Examples of prime numbers: 2 (factors 1, 2), 3 (factors 1, 3), 5 (factors 1, 5), 7 (factors 1, 7), 11 (factors 1, 11), 13 (factors 1, 13), ...
  • Composite number: a natural number that has at least one factor other than 1 and itself. So it is neither a prime number nor 1.
  • Examples of composite numbers: 4 (it has 3 factors: 1, 2, 4), 6 (it has 4 factors: 1, 2, 3, 6), 8 (it has 4 factors: 1, 2, 4, 8), 9 (it has 3 factors: 1, 3, 9), 10 (it has 4 factors: 1, 2, 5, 10), 12 (it has 6 factors: 1, 2, 3, 4, 6, 12), ...

  • » Online calculator. Check whether a number is prime or not. The prime factorization of composite numbers (decomposition into prime factors)


How to count the number of factors of a number?

Without actually finding the factors

  • If a number N is prime factorized as:
    N = am × bk × cz
    where a, b, c are the prime factors and m, k, z are their exponents, natural numbers, ....
  • ...
  • Then the number of factors of the number N can be calculated as:
    n = (m + 1) × (k + 1) × (z + 1)
  • ...
  • In our case, the number of factors is calculated as:
  • n = (18 + 1) × (2 + 1) × (3 + 1) = 19 × 3 × 4 = 228

But to actually calculate the factors, see below...

2. Multiply the prime factors of the number 809,238,528

  • Multiply the prime factors involved in the prime factorization of the number in all their unique combinations, that give different results.
  • Also consider the exponents of these prime factors.
  • Also add 1 to the list of factors (divisors). All the numbers are divisible by 1.

All the factors (divisors) are listed below - in ascending order

The list of factors (divisors):

Numbers other than 1 that are not prime factors are composite factors (divisors).

neither prime nor composite = 1
prime factor = 2
prime factor = 3
composite factor = 22 = 4
composite factor = 2 × 3 = 6
prime factor = 7
composite factor = 23 = 8
composite factor = 32 = 9
composite factor = 22 × 3 = 12
composite factor = 2 × 7 = 14
composite factor = 24 = 16
composite factor = 2 × 32 = 18
composite factor = 3 × 7 = 21
composite factor = 23 × 3 = 24
composite factor = 22 × 7 = 28
composite factor = 25 = 32
composite factor = 22 × 32 = 36
composite factor = 2 × 3 × 7 = 42
composite factor = 24 × 3 = 48
composite factor = 72 = 49
composite factor = 23 × 7 = 56
composite factor = 32 × 7 = 63
composite factor = 26 = 64
composite factor = 23 × 32 = 72
composite factor = 22 × 3 × 7 = 84
composite factor = 25 × 3 = 96
composite factor = 2 × 72 = 98
composite factor = 24 × 7 = 112
composite factor = 2 × 32 × 7 = 126
composite factor = 27 = 128
composite factor = 24 × 32 = 144
composite factor = 3 × 72 = 147
composite factor = 23 × 3 × 7 = 168
composite factor = 26 × 3 = 192
composite factor = 22 × 72 = 196
composite factor = 25 × 7 = 224
composite factor = 22 × 32 × 7 = 252
composite factor = 28 = 256
composite factor = 25 × 32 = 288
composite factor = 2 × 3 × 72 = 294
composite factor = 24 × 3 × 7 = 336
composite factor = 73 = 343
composite factor = 27 × 3 = 384
composite factor = 23 × 72 = 392
composite factor = 32 × 72 = 441
composite factor = 26 × 7 = 448
composite factor = 23 × 32 × 7 = 504
composite factor = 29 = 512
composite factor = 26 × 32 = 576
composite factor = 22 × 3 × 72 = 588
composite factor = 25 × 3 × 7 = 672
composite factor = 2 × 73 = 686
composite factor = 28 × 3 = 768
composite factor = 24 × 72 = 784
composite factor = 2 × 32 × 72 = 882
composite factor = 27 × 7 = 896
composite factor = 24 × 32 × 7 = 1,008
composite factor = 210 = 1,024
composite factor = 3 × 73 = 1,029
composite factor = 27 × 32 = 1,152
composite factor = 23 × 3 × 72 = 1,176
composite factor = 26 × 3 × 7 = 1,344
composite factor = 22 × 73 = 1,372
composite factor = 29 × 3 = 1,536
composite factor = 25 × 72 = 1,568
composite factor = 22 × 32 × 72 = 1,764
composite factor = 28 × 7 = 1,792
composite factor = 25 × 32 × 7 = 2,016
composite factor = 211 = 2,048
composite factor = 2 × 3 × 73 = 2,058
composite factor = 28 × 32 = 2,304
composite factor = 24 × 3 × 72 = 2,352
composite factor = 27 × 3 × 7 = 2,688
composite factor = 23 × 73 = 2,744
composite factor = 210 × 3 = 3,072
composite factor = 32 × 73 = 3,087
composite factor = 26 × 72 = 3,136
composite factor = 23 × 32 × 72 = 3,528
composite factor = 29 × 7 = 3,584
composite factor = 26 × 32 × 7 = 4,032
composite factor = 212 = 4,096
composite factor = 22 × 3 × 73 = 4,116
composite factor = 29 × 32 = 4,608
composite factor = 25 × 3 × 72 = 4,704
composite factor = 28 × 3 × 7 = 5,376
composite factor = 24 × 73 = 5,488
composite factor = 211 × 3 = 6,144
composite factor = 2 × 32 × 73 = 6,174
composite factor = 27 × 72 = 6,272
composite factor = 24 × 32 × 72 = 7,056
composite factor = 210 × 7 = 7,168
composite factor = 27 × 32 × 7 = 8,064
composite factor = 213 = 8,192
composite factor = 23 × 3 × 73 = 8,232
composite factor = 210 × 32 = 9,216
composite factor = 26 × 3 × 72 = 9,408
composite factor = 29 × 3 × 7 = 10,752
composite factor = 25 × 73 = 10,976
composite factor = 212 × 3 = 12,288
composite factor = 22 × 32 × 73 = 12,348
composite factor = 28 × 72 = 12,544
composite factor = 25 × 32 × 72 = 14,112
composite factor = 211 × 7 = 14,336
composite factor = 28 × 32 × 7 = 16,128
composite factor = 214 = 16,384
composite factor = 24 × 3 × 73 = 16,464
composite factor = 211 × 32 = 18,432
composite factor = 27 × 3 × 72 = 18,816
composite factor = 210 × 3 × 7 = 21,504
composite factor = 26 × 73 = 21,952
composite factor = 213 × 3 = 24,576
composite factor = 23 × 32 × 73 = 24,696
composite factor = 29 × 72 = 25,088
composite factor = 26 × 32 × 72 = 28,224
This list continues below...

... This list continues from above
composite factor = 212 × 7 = 28,672
composite factor = 29 × 32 × 7 = 32,256
composite factor = 215 = 32,768
composite factor = 25 × 3 × 73 = 32,928
composite factor = 212 × 32 = 36,864
composite factor = 28 × 3 × 72 = 37,632
composite factor = 211 × 3 × 7 = 43,008
composite factor = 27 × 73 = 43,904
composite factor = 214 × 3 = 49,152
composite factor = 24 × 32 × 73 = 49,392
composite factor = 210 × 72 = 50,176
composite factor = 27 × 32 × 72 = 56,448
composite factor = 213 × 7 = 57,344
composite factor = 210 × 32 × 7 = 64,512
composite factor = 216 = 65,536
composite factor = 26 × 3 × 73 = 65,856
composite factor = 213 × 32 = 73,728
composite factor = 29 × 3 × 72 = 75,264
composite factor = 212 × 3 × 7 = 86,016
composite factor = 28 × 73 = 87,808
composite factor = 215 × 3 = 98,304
composite factor = 25 × 32 × 73 = 98,784
composite factor = 211 × 72 = 100,352
composite factor = 28 × 32 × 72 = 112,896
composite factor = 214 × 7 = 114,688
composite factor = 211 × 32 × 7 = 129,024
composite factor = 217 = 131,072
composite factor = 27 × 3 × 73 = 131,712
composite factor = 214 × 32 = 147,456
composite factor = 210 × 3 × 72 = 150,528
composite factor = 213 × 3 × 7 = 172,032
composite factor = 29 × 73 = 175,616
composite factor = 216 × 3 = 196,608
composite factor = 26 × 32 × 73 = 197,568
composite factor = 212 × 72 = 200,704
composite factor = 29 × 32 × 72 = 225,792
composite factor = 215 × 7 = 229,376
composite factor = 212 × 32 × 7 = 258,048
composite factor = 218 = 262,144
composite factor = 28 × 3 × 73 = 263,424
composite factor = 215 × 32 = 294,912
composite factor = 211 × 3 × 72 = 301,056
composite factor = 214 × 3 × 7 = 344,064
composite factor = 210 × 73 = 351,232
composite factor = 217 × 3 = 393,216
composite factor = 27 × 32 × 73 = 395,136
composite factor = 213 × 72 = 401,408
composite factor = 210 × 32 × 72 = 451,584
composite factor = 216 × 7 = 458,752
composite factor = 213 × 32 × 7 = 516,096
composite factor = 29 × 3 × 73 = 526,848
composite factor = 216 × 32 = 589,824
composite factor = 212 × 3 × 72 = 602,112
composite factor = 215 × 3 × 7 = 688,128
composite factor = 211 × 73 = 702,464
composite factor = 218 × 3 = 786,432
composite factor = 28 × 32 × 73 = 790,272
composite factor = 214 × 72 = 802,816
composite factor = 211 × 32 × 72 = 903,168
composite factor = 217 × 7 = 917,504
composite factor = 214 × 32 × 7 = 1,032,192
composite factor = 210 × 3 × 73 = 1,053,696
composite factor = 217 × 32 = 1,179,648
composite factor = 213 × 3 × 72 = 1,204,224
composite factor = 216 × 3 × 7 = 1,376,256
composite factor = 212 × 73 = 1,404,928
composite factor = 29 × 32 × 73 = 1,580,544
composite factor = 215 × 72 = 1,605,632
composite factor = 212 × 32 × 72 = 1,806,336
composite factor = 218 × 7 = 1,835,008
composite factor = 215 × 32 × 7 = 2,064,384
composite factor = 211 × 3 × 73 = 2,107,392
composite factor = 218 × 32 = 2,359,296
composite factor = 214 × 3 × 72 = 2,408,448
composite factor = 217 × 3 × 7 = 2,752,512
composite factor = 213 × 73 = 2,809,856
composite factor = 210 × 32 × 73 = 3,161,088
composite factor = 216 × 72 = 3,211,264
composite factor = 213 × 32 × 72 = 3,612,672
composite factor = 216 × 32 × 7 = 4,128,768
composite factor = 212 × 3 × 73 = 4,214,784
composite factor = 215 × 3 × 72 = 4,816,896
composite factor = 218 × 3 × 7 = 5,505,024
composite factor = 214 × 73 = 5,619,712
composite factor = 211 × 32 × 73 = 6,322,176
composite factor = 217 × 72 = 6,422,528
composite factor = 214 × 32 × 72 = 7,225,344
composite factor = 217 × 32 × 7 = 8,257,536
composite factor = 213 × 3 × 73 = 8,429,568
composite factor = 216 × 3 × 72 = 9,633,792
composite factor = 215 × 73 = 11,239,424
composite factor = 212 × 32 × 73 = 12,644,352
composite factor = 218 × 72 = 12,845,056
composite factor = 215 × 32 × 72 = 14,450,688
composite factor = 218 × 32 × 7 = 16,515,072
composite factor = 214 × 3 × 73 = 16,859,136
composite factor = 217 × 3 × 72 = 19,267,584
composite factor = 216 × 73 = 22,478,848
composite factor = 213 × 32 × 73 = 25,288,704
composite factor = 216 × 32 × 72 = 28,901,376
composite factor = 215 × 3 × 73 = 33,718,272
composite factor = 218 × 3 × 72 = 38,535,168
composite factor = 217 × 73 = 44,957,696
composite factor = 214 × 32 × 73 = 50,577,408
composite factor = 217 × 32 × 72 = 57,802,752
composite factor = 216 × 3 × 73 = 67,436,544
composite factor = 218 × 73 = 89,915,392
composite factor = 215 × 32 × 73 = 101,154,816
composite factor = 218 × 32 × 72 = 115,605,504
composite factor = 217 × 3 × 73 = 134,873,088
composite factor = 216 × 32 × 73 = 202,309,632
composite factor = 218 × 3 × 73 = 269,746,176
composite factor = 217 × 32 × 73 = 404,619,264
composite factor = 218 × 32 × 73 = 809,238,528
228 factors (divisors)

What times what is 809,238,528?
What number multiplied by what number equals 809,238,528?

All the combinations of any two natural numbers whose product equals 809,238,528.

1 × 809,238,528 = 809,238,528
2 × 404,619,264 = 809,238,528
3 × 269,746,176 = 809,238,528
4 × 202,309,632 = 809,238,528
6 × 134,873,088 = 809,238,528
7 × 115,605,504 = 809,238,528
8 × 101,154,816 = 809,238,528
9 × 89,915,392 = 809,238,528
12 × 67,436,544 = 809,238,528
14 × 57,802,752 = 809,238,528
16 × 50,577,408 = 809,238,528
18 × 44,957,696 = 809,238,528
21 × 38,535,168 = 809,238,528
24 × 33,718,272 = 809,238,528
28 × 28,901,376 = 809,238,528
32 × 25,288,704 = 809,238,528
36 × 22,478,848 = 809,238,528
42 × 19,267,584 = 809,238,528
48 × 16,859,136 = 809,238,528
49 × 16,515,072 = 809,238,528
56 × 14,450,688 = 809,238,528
63 × 12,845,056 = 809,238,528
64 × 12,644,352 = 809,238,528
72 × 11,239,424 = 809,238,528
84 × 9,633,792 = 809,238,528
96 × 8,429,568 = 809,238,528
98 × 8,257,536 = 809,238,528
112 × 7,225,344 = 809,238,528
126 × 6,422,528 = 809,238,528
128 × 6,322,176 = 809,238,528
144 × 5,619,712 = 809,238,528
147 × 5,505,024 = 809,238,528
168 × 4,816,896 = 809,238,528
192 × 4,214,784 = 809,238,528
196 × 4,128,768 = 809,238,528
224 × 3,612,672 = 809,238,528
252 × 3,211,264 = 809,238,528
256 × 3,161,088 = 809,238,528
288 × 2,809,856 = 809,238,528
294 × 2,752,512 = 809,238,528
336 × 2,408,448 = 809,238,528
343 × 2,359,296 = 809,238,528
384 × 2,107,392 = 809,238,528
392 × 2,064,384 = 809,238,528
441 × 1,835,008 = 809,238,528
448 × 1,806,336 = 809,238,528
504 × 1,605,632 = 809,238,528
512 × 1,580,544 = 809,238,528
576 × 1,404,928 = 809,238,528
588 × 1,376,256 = 809,238,528
672 × 1,204,224 = 809,238,528
686 × 1,179,648 = 809,238,528
768 × 1,053,696 = 809,238,528
784 × 1,032,192 = 809,238,528
882 × 917,504 = 809,238,528
896 × 903,168 = 809,238,528
1,008 × 802,816 = 809,238,528
1,024 × 790,272 = 809,238,528
1,029 × 786,432 = 809,238,528
1,152 × 702,464 = 809,238,528
1,176 × 688,128 = 809,238,528
1,344 × 602,112 = 809,238,528
1,372 × 589,824 = 809,238,528
1,536 × 526,848 = 809,238,528
1,568 × 516,096 = 809,238,528
1,764 × 458,752 = 809,238,528
1,792 × 451,584 = 809,238,528
2,016 × 401,408 = 809,238,528
2,048 × 395,136 = 809,238,528
2,058 × 393,216 = 809,238,528
2,304 × 351,232 = 809,238,528
2,352 × 344,064 = 809,238,528
2,688 × 301,056 = 809,238,528
2,744 × 294,912 = 809,238,528
3,072 × 263,424 = 809,238,528
3,087 × 262,144 = 809,238,528
3,136 × 258,048 = 809,238,528
3,528 × 229,376 = 809,238,528
3,584 × 225,792 = 809,238,528
4,032 × 200,704 = 809,238,528
4,096 × 197,568 = 809,238,528
4,116 × 196,608 = 809,238,528
4,608 × 175,616 = 809,238,528
4,704 × 172,032 = 809,238,528
5,376 × 150,528 = 809,238,528
5,488 × 147,456 = 809,238,528
6,144 × 131,712 = 809,238,528
6,174 × 131,072 = 809,238,528
6,272 × 129,024 = 809,238,528
7,056 × 114,688 = 809,238,528
7,168 × 112,896 = 809,238,528
8,064 × 100,352 = 809,238,528
8,192 × 98,784 = 809,238,528
8,232 × 98,304 = 809,238,528
9,216 × 87,808 = 809,238,528
9,408 × 86,016 = 809,238,528
10,752 × 75,264 = 809,238,528
10,976 × 73,728 = 809,238,528
12,288 × 65,856 = 809,238,528
12,348 × 65,536 = 809,238,528
12,544 × 64,512 = 809,238,528
14,112 × 57,344 = 809,238,528
14,336 × 56,448 = 809,238,528
16,128 × 50,176 = 809,238,528
16,384 × 49,392 = 809,238,528
16,464 × 49,152 = 809,238,528
18,432 × 43,904 = 809,238,528
18,816 × 43,008 = 809,238,528
21,504 × 37,632 = 809,238,528
21,952 × 36,864 = 809,238,528
24,576 × 32,928 = 809,238,528
24,696 × 32,768 = 809,238,528
25,088 × 32,256 = 809,238,528
28,224 × 28,672 = 809,238,528
114 unique multiplications

The final answer:
(scroll down)


809,238,528 has 228 factors (divisors):
1; 2; 3; 4; 6; 7; 8; 9; 12; 14; 16; 18; 21; 24; 28; 32; 36; 42; 48; 49; 56; 63; 64; 72; 84; 96; 98; 112; 126; 128; 144; 147; 168; 192; 196; 224; 252; 256; 288; 294; 336; 343; 384; 392; 441; 448; 504; 512; 576; 588; 672; 686; 768; 784; 882; 896; 1,008; 1,024; 1,029; 1,152; 1,176; 1,344; 1,372; 1,536; 1,568; 1,764; 1,792; 2,016; 2,048; 2,058; 2,304; 2,352; 2,688; 2,744; 3,072; 3,087; 3,136; 3,528; 3,584; 4,032; 4,096; 4,116; 4,608; 4,704; 5,376; 5,488; 6,144; 6,174; 6,272; 7,056; 7,168; 8,064; 8,192; 8,232; 9,216; 9,408; 10,752; 10,976; 12,288; 12,348; 12,544; 14,112; 14,336; 16,128; 16,384; 16,464; 18,432; 18,816; 21,504; 21,952; 24,576; 24,696; 25,088; 28,224; 28,672; 32,256; 32,768; 32,928; 36,864; 37,632; 43,008; 43,904; 49,152; 49,392; 50,176; 56,448; 57,344; 64,512; 65,536; 65,856; 73,728; 75,264; 86,016; 87,808; 98,304; 98,784; 100,352; 112,896; 114,688; 129,024; 131,072; 131,712; 147,456; 150,528; 172,032; 175,616; 196,608; 197,568; 200,704; 225,792; 229,376; 258,048; 262,144; 263,424; 294,912; 301,056; 344,064; 351,232; 393,216; 395,136; 401,408; 451,584; 458,752; 516,096; 526,848; 589,824; 602,112; 688,128; 702,464; 786,432; 790,272; 802,816; 903,168; 917,504; 1,032,192; 1,053,696; 1,179,648; 1,204,224; 1,376,256; 1,404,928; 1,580,544; 1,605,632; 1,806,336; 1,835,008; 2,064,384; 2,107,392; 2,359,296; 2,408,448; 2,752,512; 2,809,856; 3,161,088; 3,211,264; 3,612,672; 4,128,768; 4,214,784; 4,816,896; 5,505,024; 5,619,712; 6,322,176; 6,422,528; 7,225,344; 8,257,536; 8,429,568; 9,633,792; 11,239,424; 12,644,352; 12,845,056; 14,450,688; 16,515,072; 16,859,136; 19,267,584; 22,478,848; 25,288,704; 28,901,376; 33,718,272; 38,535,168; 44,957,696; 50,577,408; 57,802,752; 67,436,544; 89,915,392; 101,154,816; 115,605,504; 134,873,088; 202,309,632; 269,746,176; 404,619,264 and 809,238,528
out of which 3 prime factors: 2; 3 and 7.
Numbers other than 1 that are not prime factors are composite factors (divisors).
809,238,528 and 1 are sometimes called improper factors, the others are called proper factors (proper divisors).

  • A quick way to find the factors (the divisors) of a number is to break it down into prime factors.
  • Then multiply the prime factors and their exponents, if any, in all their different combinations.

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Factors (divisors), common factors (common divisors), the greatest common factor, GCF (also called the greatest common divisor, GCD, or the highest common factor, HCF)

  • If the number "t" is a factor (divisor) of the number "a" then in the prime factorization of "t" we will only encounter prime factors that also occur in the prime factorization of "a".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" (powers, or multiplicities) is at most equal to the exponent of the same base that is involved in the prime factorization of "a".
  • Hint: 23 = 2 × 2 × 2 = 8. 2 is called the base and 3 is the exponent. 23 is the power and 8 is the value of the power. We sometimes say that the number 2 is raised to the power of 3.
  • For example, 12 is a factor (divisor) of 120 - the remainder is zero when dividing 120 by 12.
  • Let's look at the prime factorization of both numbers and notice the bases and the exponents that occur in the prime factorization of both numbers:
  • 12 = 2 × 2 × 3 = 22 × 3
  • 120 = 2 × 2 × 2 × 3 × 5 = 23 × 3 × 5
  • 120 contains all the prime factors of 12, and all its bases' exponents are higher than those of 12.
  • If "t" is a common factor (divisor) of "a" and "b", then the prime factorization of "t" contains only the common prime factors involved in the prime factorizations of both "a" and "b".
  • If there are exponents involved, the maximum value of an exponent for any base of a power that is found in the prime factorization of "t" is at most equal to the minimum of the exponents of the same base that is involved in the prime factorization of both "a" and "b".
  • For example, 12 is the common factor of 48 and 360.
  • The remainder is zero when dividing either 48 or 360 by 12.
  • Here there are the prime factorizations of the three numbers, 12, 48 and 360:
  • 12 = 22 × 3
  • 48 = 24 × 3
  • 360 = 23 × 32 × 5
  • Please note that 48 and 360 have more factors (divisors): 2, 3, 4, 6, 8, 12, 24. Among them, 24 is the greatest common factor, GCF (or the greatest common divisor, GCD, or the highest common factor, HCF) of 48 and 360.
  • The greatest common factor, GCF, of two numbers, "a" and "b", is the product of all the common prime factors involved in the prime factorizations of both "a" and "b", taken by the lowest exponents.
  • Based on this rule it is calculated the greatest common factor, GCF, (or the greatest common divisor GCD, HCF) of several numbers, as shown in the example below...
  • GCF, GCD (1,260; 3,024; 5,544) = ?
  • 1,260 = 22 × 32
  • 3,024 = 24 × 32 × 7
  • 5,544 = 23 × 32 × 7 × 11
  • The common prime factors are:
  • 2 - its lowest exponent (multiplicity) is: min.(2; 3; 4) = 2
  • 3 - its lowest exponent (multiplicity) is: min.(2; 2; 2) = 2
  • GCF, GCD (1,260; 3,024; 5,544) = 22 × 32 = 252
  • Coprime numbers:
  • If two numbers "a" and "b" have no other common factors (divisors) than 1, gfc, gcd, hcf (a; b) = 1, then the numbers "a" and "b" are called coprime (or relatively prime).
  • Factors of the GCF
  • If "a" and "b" are not coprime, then every common factor (divisor) of "a" and "b" is a also a factor (divisor) of the greatest common factor, GCF (greatest common divisor, GCD, highest common factor, HCF) of "a" and "b".