Numbers / 675

The Number 675

675 is composite: factorization 3^3 × 5^2. That gives 675 exactly 12 divisors: 1, 3, 5, 9, 15, 25, 27, 45, 75, 135, 225, 675. 675's proper divisors total just 565, 110 short of 675, the deficient case most of 675's neighbors share too. 675 has a digit sum of 18; for 675, the digital root works out to 9. 675: 3, 5, 9 all divide 675 evenly, out of 2-12. 675 is 1010100011 in binary and 2A3 in hex; as a Roman numeral it's DCLXXV.