630

630 is a natural number that follows 629 and precedes 631. In base 10 it is written as 630 and has prime factorization 2 × 3^2 × 5 × 7, giving it 24 positive divisors. The sum of its proper divisors is 1242, making 630 an abundant number. Its digits sum to 9, so 630 is divisible by 9 (630 ÷ 9 = 70); it is also divisible by 2, 3, 5, and 7.

In Roman numerals, 630 is written as DCXXX. The representation reflects a historical standard used across classical and medieval Europe.

Historically, the year 630 CE is notable for the Muslim conquest of Mecca, when the Prophet Muhammad led Muslim forces to capture the city, which surrendered and became a central site for Islam. The event helped consolidate the early Muslim community and solidified control over the Arabian Peninsula.

In science and measurement, 630 nanometers lies in the red region of the visible spectrum and is common in red LEDs and optical filters. In timekeeping, 630 minutes equals 10 hours and 30 minutes, while 630 seconds equals 10 minutes and 30 seconds.

In modern telecommunications, 630 is the area code for the western suburbs of Chicago, Illinois, with the 331 overlay providing additional numbers in the same region. The number appears in various cultural and practical contexts as a reference point for arithmetic, history, and everyday life.