To find all the divisors of the number 8,793,280:
- 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 8,793,280:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
8,793,280 = 26 × 5 × 27,479
8,793,280 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 = (6 + 1) × (1 + 1) × (1 + 1) = 7 × 2 × 2 = 28
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 8,793,280
- 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
composite factor = 2
2 =
4
prime factor =
5
composite factor = 2
3 =
8
composite factor = 2 × 5 =
10
composite factor = 2
4 =
16
composite factor = 2
2 × 5 =
20
composite factor = 2
5 =
32
composite factor = 2
3 × 5 =
40
composite factor = 2
6 =
64
composite factor = 2
4 × 5 =
80
composite factor = 2
5 × 5 =
160
composite factor = 2
6 × 5 =
320
This list continues below...
... This list continues from above
prime factor =
27,479
composite factor = 2 × 27,479 =
54,958
composite factor = 2
2 × 27,479 =
109,916
composite factor = 5 × 27,479 =
137,395
composite factor = 2
3 × 27,479 =
219,832
composite factor = 2 × 5 × 27,479 =
274,790
composite factor = 2
4 × 27,479 =
439,664
composite factor = 2
2 × 5 × 27,479 =
549,580
composite factor = 2
5 × 27,479 =
879,328
composite factor = 2
3 × 5 × 27,479 =
1,099,160
composite factor = 2
6 × 27,479 =
1,758,656
composite factor = 2
4 × 5 × 27,479 =
2,198,320
composite factor = 2
5 × 5 × 27,479 =
4,396,640
composite factor = 2
6 × 5 × 27,479 =
8,793,280
28 factors (divisors)
What times what is 8,793,280?
What number multiplied by what number equals 8,793,280?
All the combinations of any two natural numbers whose product equals 8,793,280.
1 × 8,793,280 = 8,793,280
2 × 4,396,640 = 8,793,280
4 × 2,198,320 = 8,793,280
5 × 1,758,656 = 8,793,280
8 × 1,099,160 = 8,793,280
10 × 879,328 = 8,793,280
16 × 549,580 = 8,793,280
20 × 439,664 = 8,793,280
32 × 274,790 = 8,793,280
40 × 219,832 = 8,793,280
64 × 137,395 = 8,793,280
80 × 109,916 = 8,793,280
160 × 54,958 = 8,793,280
320 × 27,479 = 8,793,280
14 unique multiplications The final answer:
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