To find all the divisors of the number 74,460:
- 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 74,460:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
74,460 = 22 × 3 × 5 × 17 × 73
74,460 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 = (2 + 1) × (1 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 3 × 2 × 2 × 2 × 2 = 48
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 74,460
- 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 × 5 =
10
composite factor = 2
2 × 3 =
12
composite factor = 3 × 5 =
15
prime factor =
17
composite factor = 2
2 × 5 =
20
composite factor = 2 × 3 × 5 =
30
composite factor = 2 × 17 =
34
composite factor = 3 × 17 =
51
composite factor = 2
2 × 3 × 5 =
60
composite factor = 2
2 × 17 =
68
prime factor =
73
composite factor = 5 × 17 =
85
composite factor = 2 × 3 × 17 =
102
composite factor = 2 × 73 =
146
composite factor = 2 × 5 × 17 =
170
composite factor = 2
2 × 3 × 17 =
204
composite factor = 3 × 73 =
219
composite factor = 3 × 5 × 17 =
255
This list continues below...
... This list continues from above
composite factor = 2
2 × 73 =
292
composite factor = 2
2 × 5 × 17 =
340
composite factor = 5 × 73 =
365
composite factor = 2 × 3 × 73 =
438
composite factor = 2 × 3 × 5 × 17 =
510
composite factor = 2 × 5 × 73 =
730
composite factor = 2
2 × 3 × 73 =
876
composite factor = 2
2 × 3 × 5 × 17 =
1,020
composite factor = 3 × 5 × 73 =
1,095
composite factor = 17 × 73 =
1,241
composite factor = 2
2 × 5 × 73 =
1,460
composite factor = 2 × 3 × 5 × 73 =
2,190
composite factor = 2 × 17 × 73 =
2,482
composite factor = 3 × 17 × 73 =
3,723
composite factor = 2
2 × 3 × 5 × 73 =
4,380
composite factor = 2
2 × 17 × 73 =
4,964
composite factor = 5 × 17 × 73 =
6,205
composite factor = 2 × 3 × 17 × 73 =
7,446
composite factor = 2 × 5 × 17 × 73 =
12,410
composite factor = 2
2 × 3 × 17 × 73 =
14,892
composite factor = 3 × 5 × 17 × 73 =
18,615
composite factor = 2
2 × 5 × 17 × 73 =
24,820
composite factor = 2 × 3 × 5 × 17 × 73 =
37,230
composite factor = 2
2 × 3 × 5 × 17 × 73 =
74,460
48 factors (divisors)
What times what is 74,460?
What number multiplied by what number equals 74,460?
All the combinations of any two natural numbers whose product equals 74,460.
1 × 74,460 = 74,460
2 × 37,230 = 74,460
3 × 24,820 = 74,460
4 × 18,615 = 74,460
5 × 14,892 = 74,460
6 × 12,410 = 74,460
10 × 7,446 = 74,460
12 × 6,205 = 74,460
15 × 4,964 = 74,460
17 × 4,380 = 74,460
20 × 3,723 = 74,460
30 × 2,482 = 74,460
34 × 2,190 = 74,460
51 × 1,460 = 74,460
60 × 1,241 = 74,460
68 × 1,095 = 74,460
73 × 1,020 = 74,460
85 × 876 = 74,460
102 × 730 = 74,460
146 × 510 = 74,460
170 × 438 = 74,460
204 × 365 = 74,460
219 × 340 = 74,460
255 × 292 = 74,460
24 unique multiplications The final answer:
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