810

810 = 2 x 3⁴ x 5.

810 has a representation as a sum of two squares: 810 = 9² + 27².

810 has the representation 3⁶ + 81.

810 is a value of n for which n - 1 (809) and n + 1 (811) are twin primes, and so are 2n - 1 (1619) and 2n + 1 (1621).

810 is 1100 in base 9.

The Intel i810 chipset was released in early 1999.

Source: What's Special About This Number?