638506364 has 12 divisors (see below), whose sum is σ = 1122024288. Its totient is φ = 317928000.

The previous prime is 638506357. The next prime is 638506409. The reversal of 638506364 is 463605836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330212 + ... + 332139.

It is an arithmetic number, because the mean of its divisors is an integer number (93502024).

Almost surely, 2^638506364 is an apocalyptic number.

It is an amenable number.

638506364 is a deficient number, since it is larger than the sum of its proper divisors (483517924).

638506364 is a wasteful number, since it uses less digits than its factorization.

638506364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662596 (or 662594 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 638506364 is about 25268.6834639243. The cubic root of 638506364 is about 861.1029493849.

The spelling of 638506364 in words is "six hundred thirty-eight million, five hundred six thousand, three hundred sixty-four".