638705484 has 36 divisors (see below), whose sum is σ = 1617424536. Its totient is φ = 212516928.

The previous prime is 638705477. The next prime is 638705497. The reversal of 638705484 is 484507836.

638705484 is a `hidden beast` number, since 6 + 38 + 70 + 548 + 4 = 666.

638705484 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4512 + ... + 36024.

Almost surely, 2^638705484 is an apocalyptic number.

It is an amenable number.

638705484 is an abundant number, since it is smaller than the sum of its proper divisors (978719052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638705484 is a wasteful number, since it uses less digits than its factorization.

638705484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32086 (or 32081 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 638705484 is about 25272.6232116890. The cubic root of 638705484 is about 861.1924525380.

The spelling of 638705484 in words is "six hundred thirty-eight million, seven hundred five thousand, four hundred eighty-four".