Numbers / 325

The Number 325

325 is composite: factorization 5^2 × 13. That gives 325 exactly 6 divisors: 1, 5, 13, 25, 65, 325. 325's proper divisors total just 109, 216 short of 325, the deficient case most of 325's neighbors share too. 325 is also the 25th triangular number, the sum of 1 through 25. 325 has a digit sum of 10; for 325, the digital root works out to 1. 325: 5 all divide 325 evenly, out of 2-12. 325 is 101000101 in binary and 145 in hex; as a Roman numeral it's CCCXXV.