The number 800 is an integer that follows 799 and precedes 801. It is an even number, meaning it is divisible by 2. In the decimal system, 800 is composed of 8 hundreds, 0 tens, and 0 units. In Roman numerals, 800 is represented as DCCC. This number can also be found in various contexts, such as in area codes for telephone numbers, where 800 is often associated with toll-free services in the United States.