Numbers / 158

The Number 158

158 is composite: factorization 2 × 79. That gives 158 exactly 4 divisors: 1, 2, 79, 158. 158's proper divisors total just 82, 76 short of 158, the deficient case most of 158's neighbors share too. 158 has a digit sum of 14; for 158, the digital root works out to 5. 158: 2 all divide 158 evenly, out of 2-12. 158 is 10011110 in binary and 9E in hex; as a Roman numeral it's CLVIII.