775

775 = 5 x 5 x 31.

775 is the smallest number whose ninth power has 26 digits.

775 is 1100000111 in base 2 and 11100 in base 5 (A033042). It is 30013 in base 4 and 3331 in base 6.

775 is a hypotenuse for which there exist two distinct integer triangles (A084646).

775 is a number n such that n and n² (600625) have the same integer sum (19).

775 is the sum of five consecutive cubes (A217843): 775 = 3³ + 4³ + 5³ + 6³ + 7³.

Source: What's Special About This Number?