To find all the divisors of the number 74,250:
- 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 74,250:
The prime factorization of a number: finding the prime numbers that multiply together to make that number.
74,250 = 2 × 33 × 53 × 11
74,250 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 = (1 + 1) × (3 + 1) × (3 + 1) × (1 + 1) = 2 × 4 × 4 × 2 = 64
But to actually calculate the factors, see below...
2. Multiply the prime factors of the number 74,250
- 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
prime factor =
5
composite factor = 2 × 3 =
6
composite factor = 3
2 =
9
composite factor = 2 × 5 =
10
prime factor =
11
composite factor = 3 × 5 =
15
composite factor = 2 × 3
2 =
18
composite factor = 2 × 11 =
22
composite factor = 5
2 =
25
composite factor = 3
3 =
27
composite factor = 2 × 3 × 5 =
30
composite factor = 3 × 11 =
33
composite factor = 3
2 × 5 =
45
composite factor = 2 × 5
2 =
50
composite factor = 2 × 3
3 =
54
composite factor = 5 × 11 =
55
composite factor = 2 × 3 × 11 =
66
composite factor = 3 × 5
2 =
75
composite factor = 2 × 3
2 × 5 =
90
composite factor = 3
2 × 11 =
99
composite factor = 2 × 5 × 11 =
110
composite factor = 5
3 =
125
composite factor = 3
3 × 5 =
135
composite factor = 2 × 3 × 5
2 =
150
composite factor = 3 × 5 × 11 =
165
composite factor = 2 × 3
2 × 11 =
198
composite factor = 3
2 × 5
2 =
225
composite factor = 2 × 5
3 =
250
composite factor = 2 × 3
3 × 5 =
270
This list continues below...
... This list continues from above
composite factor = 5
2 × 11 =
275
composite factor = 3
3 × 11 =
297
composite factor = 2 × 3 × 5 × 11 =
330
composite factor = 3 × 5
3 =
375
composite factor = 2 × 3
2 × 5
2 =
450
composite factor = 3
2 × 5 × 11 =
495
composite factor = 2 × 5
2 × 11 =
550
composite factor = 2 × 3
3 × 11 =
594
composite factor = 3
3 × 5
2 =
675
composite factor = 2 × 3 × 5
3 =
750
composite factor = 3 × 5
2 × 11 =
825
composite factor = 2 × 3
2 × 5 × 11 =
990
composite factor = 3
2 × 5
3 =
1,125
composite factor = 2 × 3
3 × 5
2 =
1,350
composite factor = 5
3 × 11 =
1,375
composite factor = 3
3 × 5 × 11 =
1,485
composite factor = 2 × 3 × 5
2 × 11 =
1,650
composite factor = 2 × 3
2 × 5
3 =
2,250
composite factor = 3
2 × 5
2 × 11 =
2,475
composite factor = 2 × 5
3 × 11 =
2,750
composite factor = 2 × 3
3 × 5 × 11 =
2,970
composite factor = 3
3 × 5
3 =
3,375
composite factor = 3 × 5
3 × 11 =
4,125
composite factor = 2 × 3
2 × 5
2 × 11 =
4,950
composite factor = 2 × 3
3 × 5
3 =
6,750
composite factor = 3
3 × 5
2 × 11 =
7,425
composite factor = 2 × 3 × 5
3 × 11 =
8,250
composite factor = 3
2 × 5
3 × 11 =
12,375
composite factor = 2 × 3
3 × 5
2 × 11 =
14,850
composite factor = 2 × 3
2 × 5
3 × 11 =
24,750
composite factor = 3
3 × 5
3 × 11 =
37,125
composite factor = 2 × 3
3 × 5
3 × 11 =
74,250
64 factors (divisors)
What times what is 74,250?
What number multiplied by what number equals 74,250?
All the combinations of any two natural numbers whose product equals 74,250.
1 × 74,250 = 74,250
2 × 37,125 = 74,250
3 × 24,750 = 74,250
5 × 14,850 = 74,250
6 × 12,375 = 74,250
9 × 8,250 = 74,250
10 × 7,425 = 74,250
11 × 6,750 = 74,250
15 × 4,950 = 74,250
18 × 4,125 = 74,250
22 × 3,375 = 74,250
25 × 2,970 = 74,250
27 × 2,750 = 74,250
30 × 2,475 = 74,250
33 × 2,250 = 74,250
45 × 1,650 = 74,250
50 × 1,485 = 74,250
54 × 1,375 = 74,250
55 × 1,350 = 74,250
66 × 1,125 = 74,250
75 × 990 = 74,250
90 × 825 = 74,250
99 × 750 = 74,250
110 × 675 = 74,250
125 × 594 = 74,250
135 × 550 = 74,250
150 × 495 = 74,250
165 × 450 = 74,250
198 × 375 = 74,250
225 × 330 = 74,250
250 × 297 = 74,250
270 × 275 = 74,250
32 unique multiplications The final answer:
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