Factors / Factors of 72

Factors of 72

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

72 breaks into 6 pairs, tested up to √72 ≈ 8.5; each pair multiplies back to 72 exactly. 72's full pair list is (1, 72), (2, 36), (3, 24), (4, 18), (6, 12), (8, 9), for 12 divisors in total. 72's divisors other than 72 itself sum to 123, 51 above 72: abundant. 72 is even, digit sum 9 for 72; small divisors of 72 include 2, 3, 4, 6, 8. 72 has 12 divisors; 71 has 2 and 73 has 2, so 72 wins here. 72 divided by its largest divisor, 36, gives 2.