628 = 22 x 157.
628 has a representation as sum of two squares: 628 = 122 + 222.
628 is 444 in base 12.
628 is the sum of the squares of four consecutive primes: 628 = 72 + 112 + 132 + 172.
The Indian astronomer and mathematician Brahmagupta wrote the mathematics book The Opening of the Universe in the year 628.
