Numbers / 164

The Number 164

164 is composite: factorization 2^2 × 41. That gives 164 exactly 6 divisors: 1, 2, 4, 41, 82, 164. 164's proper divisors total just 130, 34 short of 164, the deficient case most of 164's neighbors share too. 164 has a digit sum of 11; for 164, the digital root works out to 2. 164: 2, 4 all divide 164 evenly, out of 2-12. 164 is 10100100 in binary and A4 in hex; as a Roman numeral it's CLXIV.