Numbers / 285

The Number 285

285 is composite: factorization 3 × 5 × 19. That gives 285 exactly 8 divisors: 1, 3, 5, 15, 19, 57, 95, 285. 285's proper divisors total just 195, 90 short of 285, the deficient case most of 285's neighbors share too. 285 has a digit sum of 15; for 285, the digital root works out to 6. 285: 3, 5 all divide 285 evenly, out of 2-12. 285 is 100011101 in binary and 11D in hex; as a Roman numeral it's CCLXXXV.