800 (eight hundred) is the natural number following 799 and preceding 801.

List of numbers — Integers

Cardinal 800 eight hundred
Ordinal 800th eight hundredth
Factorization 2^5 \cdot 5^2
Roman numeral DCCC
Roman numeral (Unicode) DCCC, dccc
Binary 1100100000
Octal 1440
Duodecimal 568
Hexadecimal 320

It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number.

Eight hundred is also:

* The original toll-free area code for telephone calls in the North American Numbering Plan and some other countries.
* The international direct dial code for toll-free international phone calls.
* In the ISO rating standard (aka ISO 5800), a common film speed for photographic films.
* The flight number of TWA Flight 800
* The Atari 800 home computer.
* A perfect score on an individual section of the SAT test or on one of the SAT Subject Tests.