To find all the divisors of the number 79,200:
- 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 79,200:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
79,200 = 25 × 32 × 52 × 11
79,200 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), ...
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 = (5 + 1) × (2 + 1) × (2 + 1) × (1 + 1) = 6 × 3 × 3 × 2 = 108
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 79,200
- 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 = 2
2 =
4
prime factor =
5
composite factor = 2 × 3 =
6
composite factor = 2
3 =
8
composite factor = 3
2 =
9
composite factor = 2 × 5 =
10
prime factor =
11
composite factor = 2
2 × 3 =
12
composite factor = 3 × 5 =
15
composite factor = 2
4 =
16
composite factor = 2 × 3
2 =
18
composite factor = 2
2 × 5 =
20
composite factor = 2 × 11 =
22
composite factor = 2
3 × 3 =
24
composite factor = 5
2 =
25
composite factor = 2 × 3 × 5 =
30
composite factor = 2
5 =
32
composite factor = 3 × 11 =
33
composite factor = 2
2 × 3
2 =
36
composite factor = 2
3 × 5 =
40
composite factor = 2
2 × 11 =
44
composite factor = 3
2 × 5 =
45
composite factor = 2
4 × 3 =
48
composite factor = 2 × 5
2 =
50
composite factor = 5 × 11 =
55
composite factor = 2
2 × 3 × 5 =
60
composite factor = 2 × 3 × 11 =
66
composite factor = 2
3 × 3
2 =
72
composite factor = 3 × 5
2 =
75
composite factor = 2
4 × 5 =
80
composite factor = 2
3 × 11 =
88
composite factor = 2 × 3
2 × 5 =
90
composite factor = 2
5 × 3 =
96
composite factor = 3
2 × 11 =
99
composite factor = 2
2 × 5
2 =
100
composite factor = 2 × 5 × 11 =
110
composite factor = 2
3 × 3 × 5 =
120
composite factor = 2
2 × 3 × 11 =
132
composite factor = 2
4 × 3
2 =
144
composite factor = 2 × 3 × 5
2 =
150
composite factor = 2
5 × 5 =
160
composite factor = 3 × 5 × 11 =
165
composite factor = 2
4 × 11 =
176
composite factor = 2
2 × 3
2 × 5 =
180
composite factor = 2 × 3
2 × 11 =
198
composite factor = 2
3 × 5
2 =
200
composite factor = 2
2 × 5 × 11 =
220
composite factor = 3
2 × 5
2 =
225
composite factor = 2
4 × 3 × 5 =
240
composite factor = 2
3 × 3 × 11 =
264
composite factor = 5
2 × 11 =
275
This list continues below...
... This list continues from above
composite factor = 2
5 × 3
2 =
288
composite factor = 2
2 × 3 × 5
2 =
300
composite factor = 2 × 3 × 5 × 11 =
330
composite factor = 2
5 × 11 =
352
composite factor = 2
3 × 3
2 × 5 =
360
composite factor = 2
2 × 3
2 × 11 =
396
composite factor = 2
4 × 5
2 =
400
composite factor = 2
3 × 5 × 11 =
440
composite factor = 2 × 3
2 × 5
2 =
450
composite factor = 2
5 × 3 × 5 =
480
composite factor = 3
2 × 5 × 11 =
495
composite factor = 2
4 × 3 × 11 =
528
composite factor = 2 × 5
2 × 11 =
550
composite factor = 2
3 × 3 × 5
2 =
600
composite factor = 2
2 × 3 × 5 × 11 =
660
composite factor = 2
4 × 3
2 × 5 =
720
composite factor = 2
3 × 3
2 × 11 =
792
composite factor = 2
5 × 5
2 =
800
composite factor = 3 × 5
2 × 11 =
825
composite factor = 2
4 × 5 × 11 =
880
composite factor = 2
2 × 3
2 × 5
2 =
900
composite factor = 2 × 3
2 × 5 × 11 =
990
composite factor = 2
5 × 3 × 11 =
1,056
composite factor = 2
2 × 5
2 × 11 =
1,100
composite factor = 2
4 × 3 × 5
2 =
1,200
composite factor = 2
3 × 3 × 5 × 11 =
1,320
composite factor = 2
5 × 3
2 × 5 =
1,440
composite factor = 2
4 × 3
2 × 11 =
1,584
composite factor = 2 × 3 × 5
2 × 11 =
1,650
composite factor = 2
5 × 5 × 11 =
1,760
composite factor = 2
3 × 3
2 × 5
2 =
1,800
composite factor = 2
2 × 3
2 × 5 × 11 =
1,980
composite factor = 2
3 × 5
2 × 11 =
2,200
composite factor = 2
5 × 3 × 5
2 =
2,400
composite factor = 3
2 × 5
2 × 11 =
2,475
composite factor = 2
4 × 3 × 5 × 11 =
2,640
composite factor = 2
5 × 3
2 × 11 =
3,168
composite factor = 2
2 × 3 × 5
2 × 11 =
3,300
composite factor = 2
4 × 3
2 × 5
2 =
3,600
composite factor = 2
3 × 3
2 × 5 × 11 =
3,960
composite factor = 2
4 × 5
2 × 11 =
4,400
composite factor = 2 × 3
2 × 5
2 × 11 =
4,950
composite factor = 2
5 × 3 × 5 × 11 =
5,280
composite factor = 2
3 × 3 × 5
2 × 11 =
6,600
composite factor = 2
5 × 3
2 × 5
2 =
7,200
composite factor = 2
4 × 3
2 × 5 × 11 =
7,920
composite factor = 2
5 × 5
2 × 11 =
8,800
composite factor = 2
2 × 3
2 × 5
2 × 11 =
9,900
composite factor = 2
4 × 3 × 5
2 × 11 =
13,200
composite factor = 2
5 × 3
2 × 5 × 11 =
15,840
composite factor = 2
3 × 3
2 × 5
2 × 11 =
19,800
composite factor = 2
5 × 3 × 5
2 × 11 =
26,400
composite factor = 2
4 × 3
2 × 5
2 × 11 =
39,600
composite factor = 2
5 × 3
2 × 5
2 × 11 =
79,200
108 factors (divisors)
What times what is 79,200?
What number multiplied by what number equals 79,200?
All the combinations of any two natural numbers whose product equals 79,200.
1 × 79,200 = 79,200
2 × 39,600 = 79,200
3 × 26,400 = 79,200
4 × 19,800 = 79,200
5 × 15,840 = 79,200
6 × 13,200 = 79,200
8 × 9,900 = 79,200
9 × 8,800 = 79,200
10 × 7,920 = 79,200
11 × 7,200 = 79,200
12 × 6,600 = 79,200
15 × 5,280 = 79,200
16 × 4,950 = 79,200
18 × 4,400 = 79,200
20 × 3,960 = 79,200
22 × 3,600 = 79,200
24 × 3,300 = 79,200
25 × 3,168 = 79,200
30 × 2,640 = 79,200
32 × 2,475 = 79,200
33 × 2,400 = 79,200
36 × 2,200 = 79,200
40 × 1,980 = 79,200
44 × 1,800 = 79,200
45 × 1,760 = 79,200
48 × 1,650 = 79,200
50 × 1,584 = 79,200
55 × 1,440 = 79,200
60 × 1,320 = 79,200
66 × 1,200 = 79,200
72 × 1,100 = 79,200
75 × 1,056 = 79,200
80 × 990 = 79,200
88 × 900 = 79,200
90 × 880 = 79,200
96 × 825 = 79,200
99 × 800 = 79,200
100 × 792 = 79,200
110 × 720 = 79,200
120 × 660 = 79,200
132 × 600 = 79,200
144 × 550 = 79,200
150 × 528 = 79,200
160 × 495 = 79,200
165 × 480 = 79,200
176 × 450 = 79,200
180 × 440 = 79,200
198 × 400 = 79,200
200 × 396 = 79,200
220 × 360 = 79,200
225 × 352 = 79,200
240 × 330 = 79,200
264 × 300 = 79,200
275 × 288 = 79,200
54 unique multiplications The final answer:
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