638340158388 has 24 divisors (see below), whose sum is σ = 1504207504800. Its totient is φ = 210673319200.

The previous prime is 638340158387. The next prime is 638340158497. The reversal of 638340158388 is 883851043836.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638340158387) 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, 263340438 + ... + 263342861.

It is an arithmetic number, because the mean of its divisors is an integer number (62675312700).

Almost surely, 2^638340158388 is an apocalyptic number.

It is an amenable number.

638340158388 is an abundant number, since it is smaller than the sum of its proper divisors (865867346412).

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

638340158388 is a wasteful number, since it uses less digits than its factorization.

638340158388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526683407 (or 526683405 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 638340158388 in words is "six hundred thirty-eight billion, three hundred forty million, one hundred fifty-eight thousand, three hundred eighty-eight".