799 is the smallest number with a composite sum of digits (7 + 9 + 9 = 25) and a prime sum of cubes of digits (73 + 93 + 93 = 1801).
799 is the smallest number whose sum of digits is 25.
799 is a number that cannot be written as a sum of three squares.
799 is the sum of 11 positive fifth powers: 799 = 35 + 35 + 35 + 25 + 25 + 15 + 15 + 15 + 15 + 15 + 15.
Source: Number Gossip