638004631 has 8 divisors (see below), whose sum is σ = 712191744. Its totient is φ = 566515320.

The previous prime is 638004623. The next prime is 638004641. The reversal of 638004631 is 136400836.

638004631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 638004631 - 2³ = 638004623 is a prime.

It is a super-2 number, since 2×638004631² = 814099818354892322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638004593 and 638004602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638004641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673951 + ... + 674896.

It is an arithmetic number, because the mean of its divisors is an integer number (89023968).

Almost surely, 2^638004631 is an apocalyptic number.

638004631 is a deficient number, since it is larger than the sum of its proper divisors (74187113).

638004631 is a wasteful number, since it uses less digits than its factorization.

638004631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348901.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 638004631 is about 25258.7535519867. The cubic root of 638004631 is about 860.8773410979.

The spelling of 638004631 in words is "six hundred thirty-eight million, four thousand, six hundred thirty-one".