638562672 has 60 divisors (see below), whose sum is σ = 1949556024. Its totient is φ = 193503360.

The previous prime is 638562671. The next prime is 638562719. The reversal of 638562672 is 276265836.

It is a happy number.

638562672 is a `hidden beast` number, since 6 + 385 + 6 + 267 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638562671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199983 + ... + 203150.

Almost surely, 2^638562672 is an apocalyptic number.

It is an amenable number.

638562672 is an abundant number, since it is smaller than the sum of its proper divisors (1310993352).

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

638562672 is a wasteful number, since it uses less digits than its factorization.

638562672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403158 (or 403149 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 638562672 is about 25269.7976248327. The cubic root of 638562672 is about 861.1282613537.

The spelling of 638562672 in words is "six hundred thirty-eight million, five hundred sixty-two thousand, six hundred seventy-two".