638815004 has 6 divisors (see below), whose sum is σ = 1117926264. Its totient is φ = 319407500.

The previous prime is 638814977. The next prime is 638815019. The reversal of 638815004 is 400518836.

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 as a sum of consecutive naturals, namely, 79851872 + ... + 79851879.

It is an arithmetic number, because the mean of its divisors is an integer number (186321044).

Almost surely, 2^638815004 is an apocalyptic number.

It is an amenable number.

638815004 is a deficient number, since it is larger than the sum of its proper divisors (479111260).

638815004 is a wasteful number, since it uses less digits than its factorization.

638815004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159703755 (or 159703753 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 638815004 is about 25274.7898903235. The cubic root of 638815004 is about 861.2416731409.

The spelling of 638815004 in words is "six hundred thirty-eight million, eight hundred fifteen thousand, four".