Factors / Factors of 135

Factors of 135

1, 3, 5, 9, 15, 27, 45, 135

135 breaks into 4 pairs, tested up to √135 ≈ 11.6; each pair multiplies back to 135 exactly. 135's full pair list is (1, 135), (3, 45), (5, 27), (9, 15), for 8 divisors in total. 135's divisors other than 135 itself sum to just 105, 30 below 135: the common deficient case. 135 is odd, digit sum 9 for 135; small divisors of 135 include 3, 5, 9. 135 has 8 divisors; 134 has 4 and 136 has 8, so 135 wins here. 135 divided by its largest divisor, 45, gives 3.