Factors / Factors of 278

Factors of 278

1, 2, 139, 278

278 breaks into 2 pairs, tested up to √278 ≈ 16.7; each pair multiplies back to 278 exactly. 278's full pair list is (1, 278), (2, 139), for 4 divisors in total. 278's divisors other than 278 itself sum to just 142, 136 below 278: the common deficient case. 278 is even, digit sum 17 for 278; small divisors of 278 include 2. 278 has 4 divisors; 277 has 2 and 279 has 6, so 279 wins here. 278 divided by its largest divisor, 139, gives 2.