629

629 is an integer that follows 628 and precedes 630. In mathematics, it is an odd composite number with prime factorization 17 × 37, making it a semiprime. Its divisors are 1, 17, 37, and 629. In various numeral systems, 629 is written as 0x275 in hexadecimal and 1001110101 in binary; in Roman numerals it is DCXXIX. The number is not a square or cube, and its approximate square root is 25.08.

In history, the year 629 CE saw events such as the Battle of Muʿtah near Muʿtah in present-day Jordan, one of the early large-scale engagements between the Muslim community and the Byzantine Empire. This year is often noted in discussions of early Islamic–Byzantine conflicts and the expansion of the Muslim community in the Levant.

Culturally, 629 is used as a calendar year in historical and archival contexts and can appear in lists of years, mathematical examples, or numeral demonstrations. Its factorization into two primes (17 and 37) is a common illustrative example in introductory number theory for semiprimes and basic divisor structure.