638487472 has 20 divisors (see below), whose sum is σ = 1413793936. Its totient is φ = 273637440.

The previous prime is 638487469. The next prime is 638487491. The reversal of 638487472 is 274784836.

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 in 3 ways as a sum of consecutive naturals, for example, 2850279 + ... + 2850502.

Almost surely, 2^638487472 is an apocalyptic number.

It is an amenable number.

638487472 is an abundant number, since it is smaller than the sum of its proper divisors (775306464).

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

638487472 is a wasteful number, since it uses less digits than its factorization.

638487472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700796 (or 5700790 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 49.

The square root of 638487472 is about 25268.3096387550. The cubic root of 638487472 is about 861.0944565865.

The spelling of 638487472 in words is "six hundred thirty-eight million, four hundred eighty-seven thousand, four hundred seventy-two".