38637644656 has 40 divisors (see below), whose sum is σ = 80635366784. Its totient is φ = 17829123840.

The previous prime is 38637644651. The next prime is 38637644663. The reversal of 38637644656 is 65644673683.

It is a self number, because there is not a number n which added to its sum of digits gives 38637644656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38637644651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1188490 + ... + 1220566.

Almost surely, 2^38637644656 is an apocalyptic number.

It is an amenable number.

38637644656 is an abundant number, since it is smaller than the sum of its proper divisors (41997722128).

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

38637644656 is a wasteful number, since it uses less digits than its factorization.

38637644656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37889 (or 37883 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 58.

The spelling of 38637644656 in words is "thirty-eight billion, six hundred thirty-seven million, six hundred forty-four thousand, six hundred fifty-six".