Numbers / 728

The Number 728

728 is composite: factorization 2^3 × 7 × 13. That gives 728 exactly 16 divisors: 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728. 728's proper divisors total 952, 224 more than 728 itself, so 728 is abundant. 728 has a digit sum of 17; for 728, the digital root works out to 8. 728: 2, 4, 7, 8 all divide 728 evenly, out of 2-12. 728 is 1011011000 in binary and 2D8 in hex; as a Roman numeral it's DCCXXVIII.