For 63: 3 and 7
For 72: 2 and 3
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The prime factors for 72 are: 2, 3
No, they are not relatively prime.
The factors of 63 are: 1 3 7 9 21 63. The prime factors are: 3 and 7
Apart from 1, all of the other factors of 72 are multiples of prime factors.
As a product of its prime factors: 3*3*7 = 63