Numbers / 79

The Number 79

79 is prime: only 1 and 79 divide it evenly; the next prime after 79 is 83. 79's proper divisors total just 1, 78 short of 79, the deficient case most of 79's neighbors share too. 79 has a digit sum of 16; for 79, the digital root works out to 7. 79 shares no factor with 2-12; 79's own divisors start beyond that range. 79 is 1001111 in binary and 4F in hex; as a Roman numeral it's LXXIX.