676

676 = 2² x 13².

676 = 26², a perfect square.

676 is the smallest palindromic square whose square root is not palindromic.

676 has a representation as a sum of two squares: 676 = 10² + 24².

676 is a divisor of 99⁴ - 1.

676 is 1010100100 in base 2 (binary).

676 Melitta is an asteroid discovered in 1909.

Source: Number Gossip