The prime factors for 72 are: 2, 3
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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.
For 63: 3 and 7 For 72: 2 and 3
As a product of its prime factors: 2*2*2*3*3 = 72
The prime factorization of 72 is 2 x 2 x 2 x 3 x 3 The prime factors of 72 are 2 and 3. Prime factorizations may contain repeated factors. When you list the factors, you only need to list them once.