Numbers / 628

The Number 628

628 is composite: factorization 2^2 × 157. That gives 628 exactly 6 divisors: 1, 2, 4, 157, 314, 628. 628's proper divisors total just 478, 150 short of 628, the deficient case most of 628's neighbors share too. 628 has a digit sum of 16; for 628, the digital root works out to 7. 628: 2, 4 all divide 628 evenly, out of 2-12. 628 is 1001110100 in binary and 274 in hex; as a Roman numeral it's DCXXVIII.