765 = 3 x 3 x 5 x 17.
765 has two representations as a sum of two squares: 765 = 62 + 272 = 182 + 212.
765 = 401 + 263 + 89 + 7 + 5. Its reversal, 567, is the smallest number that is the sum of different primes using all ten digits.
765 is 1011111101 in base 2 (A006995) and 636 in base 11.
765 is the sum of eight positive fifth powers (A003353): 765 = 35 + 35 + 35 + 25 + 15 + 15 + 15 + 15.
Source: Prime Curios!
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