Numbers / 305

The Number 305

305 is composite: factorization 5 × 61. That gives 305 exactly 4 divisors: 1, 5, 61, 305. 305's proper divisors total just 67, 238 short of 305, the deficient case most of 305's neighbors share too. 305 has a digit sum of 8; for 305, the digital root works out to 8. 305: 5 all divide 305 evenly, out of 2-12. 305 is 100110001 in binary and 131 in hex; as a Roman numeral it's CCCV.