638857630 has 16 divisors (see below), whose sum is σ = 1150245360. Its totient is φ = 255476032.

The previous prime is 638857627. The next prime is 638857657. The reversal of 638857630 is 36758836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53226 + ... + 64114.

It is an arithmetic number, because the mean of its divisors is an integer number (71890335).

Almost surely, 2^638857630 is an apocalyptic number.

638857630 is a deficient number, since it is larger than the sum of its proper divisors (511387730).

638857630 is a wasteful number, since it uses less digits than its factorization.

638857630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16763.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 638857630 is about 25275.6331275796. The cubic root of 638857630 is about 861.2608286454.

The spelling of 638857630 in words is "six hundred thirty-eight million, eight hundred fifty-seven thousand, six hundred thirty".