Factors / Factors of 90

Factors of 90

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

90 breaks into 6 pairs, tested up to √90 ≈ 9.5; each pair multiplies back to 90 exactly. 90's full pair list is (1, 90), (2, 45), (3, 30), (5, 18), (6, 15), (9, 10), for 12 divisors in total. 90's divisors other than 90 itself sum to 144, 54 above 90: abundant. 90 is even, digit sum 9 for 90; small divisors of 90 include 2, 3, 5, 6, 9. 90 has 12 divisors; 89 has 2 and 91 has 4, so 90 wins here. 90 divided by its largest divisor, 45, gives 2.