677

677 is a prime number.

677 has a representation as a sum of two squares: 677 = 1² + 26².

677 is the sum of three consecutive squares: 677 = 14² + 15² + 16².

677 is the hypotenuse of a primitive Pythagorean triple: 677² = 52² + 675².

677 Aaltje is an asteroid named for a Dutch singer.

Source: Prime Curios!