634638 has 24 divisors (see below), whose sum is σ = 1344168. Its totient is φ = 199728.

The previous prime is 634609. The next prime is 634643. The reversal of 634638 is 836436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2020 + ... + 2312.

It is an arithmetic number, because the mean of its divisors is an integer number (56007).

2⁶³⁴⁶³⁸ is an apocalyptic number.

634638 is an abundant number, since it is smaller than the sum of its proper divisors (709530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634638 is a wasteful number, since it uses less digits than its factorization.

634638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 317 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 634638 is about 796.6417011430. The cubic root of 634638 is about 85.9360440304.

The spelling of 634638 in words is "six hundred thirty-four thousand, six hundred thirty-eight".