Numbers / 556

The Number 556

556 is composite: factorization 2^2 × 139. That gives 556 exactly 6 divisors: 1, 2, 4, 139, 278, 556. 556's proper divisors total just 424, 132 short of 556, the deficient case most of 556's neighbors share too. 556 has a digit sum of 16; for 556, the digital root works out to 7. 556: 2, 4 all divide 556 evenly, out of 2-12. 556 is 1000101100 in binary and 22C in hex; as a Roman numeral it's DLVI.