638484508 has 12 divisors (see below), whose sum is σ = 1165928400. Its totient is φ = 305362112.

The previous prime is 638484491. The next prime is 638484571. The reversal of 638484508 is 805484836.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 3469933 + ... + 3470116.

It is an arithmetic number, because the mean of its divisors is an integer number (97160700).

Almost surely, 2^638484508 is an apocalyptic number.

It is an amenable number.

638484508 is a deficient number, since it is larger than the sum of its proper divisors (527443892).

638484508 is a wasteful number, since it uses less digits than its factorization.

638484508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940076 (or 6940074 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The square root of 638484508 is about 25268.2509881472. The cubic root of 638484508 is about 861.0931241208.

The spelling of 638484508 in words is "six hundred thirty-eight million, four hundred eighty-four thousand, five hundred eight".