Factors / Factors of 256

Factors of 256

1, 2, 4, 8, 16, 32, 64, 128, 256

256 is a perfect square (16² = 256); that gives 256 an odd 9-divisor count, since only 16 pairs with itself. 256's full pair list is (1, 256), (2, 128), (4, 64), (8, 32), (16, 16), for 9 divisors in total. 256's divisors other than 256 itself sum to just 255, 1 below 256: the common deficient case. 256 is even, digit sum 13 for 256; small divisors of 256 include 2, 4, 8. 256 has 9 divisors; 255 has 8 and 257 has 2, so 256 wins here. 256 divided by its largest divisor, 128, gives 2.