Factors / Factors of 128

Factors of 128

1, 2, 4, 8, 16, 32, 64, 128

128 breaks into 4 pairs, tested up to √128 ≈ 11.3; each pair multiplies back to 128 exactly. 128's full pair list is (1, 128), (2, 64), (4, 32), (8, 16), for 8 divisors in total. 128's divisors other than 128 itself sum to just 127, 1 below 128: the common deficient case. 128 is even, digit sum 11 for 128; small divisors of 128 include 2, 4, 8. 128 has 8 divisors; 127 has 2 and 129 has 4, so 128 wins here. 128 divided by its largest divisor, 64, gives 2.