638164932 has 24 divisors (see below), whose sum is σ = 1567423200. Its totient is φ = 201525696.

The previous prime is 638164909. The next prime is 638164939. The reversal of 638164932 is 239461836.

It is not an unprimeable number, because it can be changed into a prime (638164939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1399257 + ... + 1399712.

It is an arithmetic number, because the mean of its divisors is an integer number (65309300).

Almost surely, 2^638164932 is an apocalyptic number.

It is an amenable number.

638164932 is an abundant number, since it is smaller than the sum of its proper divisors (929258268).

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

638164932 is a wasteful number, since it uses less digits than its factorization.

638164932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798995 (or 2798993 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 638164932 is about 25261.9265298591. The cubic root of 638164932 is about 860.9494345885.

The spelling of 638164932 in words is "six hundred thirty-eight million, one hundred sixty-four thousand, nine hundred thirty-two".