Numbers / 615

The Number 615

615 is composite: factorization 3 × 5 × 41. That gives 615 exactly 8 divisors: 1, 3, 5, 15, 41, 123, 205, 615. 615's proper divisors total just 393, 222 short of 615, the deficient case most of 615's neighbors share too. 615 has a digit sum of 12; for 615, the digital root works out to 3. 615: 3, 5 all divide 615 evenly, out of 2-12. 615 is 1001100111 in binary and 267 in hex; as a Roman numeral it's DCXV.