634138636 has 24 divisors (see below), whose sum is σ = 1144483200. Its totient is φ = 307248000.

The previous prime is 634138627. The next prime is 634138649. The reversal of 634138636 is 636831436.

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 7 ways as a sum of consecutive naturals, for example, 11461 + ... + 37411.

It is an arithmetic number, because the mean of its divisors is an integer number (47686800).

Almost surely, 2^634138636 is an apocalyptic number.

It is an amenable number.

634138636 is a deficient number, since it is larger than the sum of its proper divisors (510344564).

634138636 is a wasteful number, since it uses less digits than its factorization.

634138636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26145 (or 26143 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 634138636 is about 25182.1094430153. The cubic root of 634138636 is about 859.1349856511.

The spelling of 634138636 in words is "six hundred thirty-four million, one hundred thirty-eight thousand, six hundred thirty-six".