630688 has 12 divisors (see below), whose sum is σ = 1241730. Its totient is φ = 315328.

The previous prime is 630677. The next prime is 630689. The reversal of 630688 is 886036.

630688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 535824 + 94864 = 732^2 + 308^2 .

It is not an unprimeable number, because it can be changed into a prime (630689) by changing a digit.

630688 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9823 + ... + 9886.

2⁶³⁰⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

630688 is a deficient number, since it is larger than the sum of its proper divisors (611042).

630688 is a wasteful number, since it uses less digits than its factorization.

630688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19719 (or 19711 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 630688 is about 794.1586743214. The cubic root of 630688 is about 85.7573836174.

The spelling of 630688 in words is "six hundred thirty thousand, six hundred eighty-eight".