To find all the divisors of the number 89,712:
- 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 89,712:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
89,712 = 24 × 32 × 7 × 89
89,712 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 = (4 + 1) × (2 + 1) × (1 + 1) × (1 + 1) = 5 × 3 × 2 × 2 = 60
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 89,712
- 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
composite factor = 2 × 3 =
6
prime factor =
7
composite factor = 2
3 =
8
composite factor = 3
2 =
9
composite factor = 2
2 × 3 =
12
composite factor = 2 × 7 =
14
composite factor = 2
4 =
16
composite factor = 2 × 3
2 =
18
composite factor = 3 × 7 =
21
composite factor = 2
3 × 3 =
24
composite factor = 2
2 × 7 =
28
composite factor = 2
2 × 3
2 =
36
composite factor = 2 × 3 × 7 =
42
composite factor = 2
4 × 3 =
48
composite factor = 2
3 × 7 =
56
composite factor = 3
2 × 7 =
63
composite factor = 2
3 × 3
2 =
72
composite factor = 2
2 × 3 × 7 =
84
prime factor =
89
composite factor = 2
4 × 7 =
112
composite factor = 2 × 3
2 × 7 =
126
composite factor = 2
4 × 3
2 =
144
composite factor = 2
3 × 3 × 7 =
168
composite factor = 2 × 89 =
178
composite factor = 2
2 × 3
2 × 7 =
252
composite factor = 3 × 89 =
267
This list continues below...
... This list continues from above
composite factor = 2
4 × 3 × 7 =
336
composite factor = 2
2 × 89 =
356
composite factor = 2
3 × 3
2 × 7 =
504
composite factor = 2 × 3 × 89 =
534
composite factor = 7 × 89 =
623
composite factor = 2
3 × 89 =
712
composite factor = 3
2 × 89 =
801
composite factor = 2
4 × 3
2 × 7 =
1,008
composite factor = 2
2 × 3 × 89 =
1,068
composite factor = 2 × 7 × 89 =
1,246
composite factor = 2
4 × 89 =
1,424
composite factor = 2 × 3
2 × 89 =
1,602
composite factor = 3 × 7 × 89 =
1,869
composite factor = 2
3 × 3 × 89 =
2,136
composite factor = 2
2 × 7 × 89 =
2,492
composite factor = 2
2 × 3
2 × 89 =
3,204
composite factor = 2 × 3 × 7 × 89 =
3,738
composite factor = 2
4 × 3 × 89 =
4,272
composite factor = 2
3 × 7 × 89 =
4,984
composite factor = 3
2 × 7 × 89 =
5,607
composite factor = 2
3 × 3
2 × 89 =
6,408
composite factor = 2
2 × 3 × 7 × 89 =
7,476
composite factor = 2
4 × 7 × 89 =
9,968
composite factor = 2 × 3
2 × 7 × 89 =
11,214
composite factor = 2
4 × 3
2 × 89 =
12,816
composite factor = 2
3 × 3 × 7 × 89 =
14,952
composite factor = 2
2 × 3
2 × 7 × 89 =
22,428
composite factor = 2
4 × 3 × 7 × 89 =
29,904
composite factor = 2
3 × 3
2 × 7 × 89 =
44,856
composite factor = 2
4 × 3
2 × 7 × 89 =
89,712
60 factors (divisors)
What times what is 89,712?
What number multiplied by what number equals 89,712?
All the combinations of any two natural numbers whose product equals 89,712.
1 × 89,712 = 89,712
2 × 44,856 = 89,712
3 × 29,904 = 89,712
4 × 22,428 = 89,712
6 × 14,952 = 89,712
7 × 12,816 = 89,712
8 × 11,214 = 89,712
9 × 9,968 = 89,712
12 × 7,476 = 89,712
14 × 6,408 = 89,712
16 × 5,607 = 89,712
18 × 4,984 = 89,712
21 × 4,272 = 89,712
24 × 3,738 = 89,712
28 × 3,204 = 89,712
36 × 2,492 = 89,712
42 × 2,136 = 89,712
48 × 1,869 = 89,712
56 × 1,602 = 89,712
63 × 1,424 = 89,712
72 × 1,246 = 89,712
84 × 1,068 = 89,712
89 × 1,008 = 89,712
112 × 801 = 89,712
126 × 712 = 89,712
144 × 623 = 89,712
168 × 534 = 89,712
178 × 504 = 89,712
252 × 356 = 89,712
267 × 336 = 89,712
30 unique multiplications The final answer:
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