700

700 is a natural number that follows 699 and precedes 701. In decimal notation it is written as 700, and in Roman numerals it is DCC.

In mathematics, 700 factors as 2^2 × 5^2 × 7. This makes it a composite number with 18 positive divisors. Other common representations include binary 1010111100, hexadecimal 0x2BC, and octal 1274. The number is divisible by 7 and by 4, and it is a Harshad (Niven) number in base 10 because it is divisible by the sum of its digits (7 + 0 + 0 = 7).

The name derives from the base-10 system and the English words seven and hundred, the latter originating from Old English for a large unit of hundred.

In the calendar, 700 CE is the last year of the seventh century in the proleptic Gregorian calendar, placing it in the early medieval period for historical reference.

In science and measurement, wavelengths around 700 nanometers lie at the red end of the visible spectrum and near the boundary with near-infrared light. The number 700 also appears in various measurement scales, model numbers, and list ordinals where exact integers are used as markers or thresholds. Overall, 700 is a midrange composite integer with straightforward base representations and common cultural usage as a numerical label.