Numbers / 558

The Number 558

558 is composite: factorization 2 × 3^2 × 31. That gives 558 exactly 12 divisors: 1, 2, 3, 6, 9, 18, 31, 62, 93, 186, 279, 558. 558's proper divisors total 690, 132 more than 558 itself, so 558 is abundant. 558 has a digit sum of 18; for 558, the digital root works out to 9. 558: 2, 3, 6, 9 all divide 558 evenly, out of 2-12. 558 is 1000101110 in binary and 22E in hex; as a Roman numeral it's DLVIII.