850

850 = 2 x 5² x 17.

850 has three representations as a sum of two squares: 850 = 3² + 29² = 11² + 27² = 15² + 25².

850 is the number of trees on 14 vertices with graph diameter 7.

850 is 2323 in base 7 and 1144 in base 9.

850 is the maximum Fair Isaac credit score.

Source: What's Special About This Number?