800

800 = 2⁵ x 5².

800 has two representations as a sum of two squares: 800 = 4² + 28² = 20² + 20².

800 is 2222 in base 7 and 200 in base 20.

800⁸ + 1 is a prime number.

800 is the sum of four consecutive prime numbers: 800 = 193 + 197 + 199 + 211.

T-800 was the robot in the film The Terminator.

Source: Prime Curios!