72 only has two prime factors, so we're going to have to repeat one.
2,2,2 = 6
2,2,3 = 7
2,3,3 = 8
3,3,3 = 9
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The prime factors for 72 are: 2, 3
Apart from 1, all of the other factors of 72 are multiples of prime factors.
55 and 72 are relatively prime because they have no prime factors in common.
1, 36 and 72
The sum of the positive whole-number factors of 30 is 72.