72 = 23x32
2^5 × 5^3
3 x 5 x 5 = 75
72 = 23 x 32
245 = 5 × 72
Use a factor tree. 72 36,2 18,2,2 9,2,2,2 3,3,2,2,2
72 36,2 18,2,2 9,2,2,2 3,3,2,2,2
There are no multiples of 72 that are prime.
The prime factorization for 72 is in the following 2.2.2.3.3=72
The prime factorization of 72 is 72 9 x 8
32 x 5 x 72
The prime factors for 72 are: 2, 3
55 and 72 are relatively prime because they have no prime factors in common.