Numbers / 280

The Number 280

280 is composite: factorization 2^3 × 5 × 7. That gives 280 exactly 16 divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280. 280's proper divisors total 440, 160 more than 280 itself, so 280 is abundant. 280 has a digit sum of 10; for 280, the digital root works out to 1. 280: 2, 4, 5, 7, 8, 10 all divide 280 evenly, out of 2-12. 280 is 100011000 in binary and 118 in hex; as a Roman numeral it's CCLXXX.