638630 has 8 divisors (see below), whose sum is σ = 1149552. Its totient is φ = 255448.

The previous prime is 638629. The next prime is 638633. The reversal of 638630 is 36836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 638630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31922 + ... + 31941.

It is an arithmetic number, because the mean of its divisors is an integer number (143694).

2⁶³⁸⁶³⁰ is an apocalyptic number.

638630 is a deficient number, since it is larger than the sum of its proper divisors (510922).

638630 is a wasteful number, since it uses less digits than its factorization.

638630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63870.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 638630 is about 799.1432912814. The cubic root of 638630 is about 86.1158525157.

The spelling of 638630 in words is "six hundred thirty-eight thousand, six hundred thirty".