Numbers / 180

The Number 180

180 is composite: factorization 2^2 × 3^2 × 5. That gives 180 exactly 18 divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180. 180's proper divisors total 366, 186 more than 180 itself, so 180 is abundant. 180 has a digit sum of 9; for 180, the digital root works out to 9. 180: 2, 3, 4, 5, 6, 9, 10, 12 all divide 180 evenly, out of 2-12. 180 is 10110100 in binary and B4 in hex; as a Roman numeral it's CLXXX.