18876988644 has 48 divisors (see below), whose sum is σ = 44576098560. Its totient is φ = 6216756480.

The previous prime is 18876988643. The next prime is 18876988673. The reversal of 18876988644 is 44688967881.

It is not an unprimeable number, because it can be changed into a prime (18876988643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1513554 + ... + 1525974.

It is an arithmetic number, because the mean of its divisors is an integer number (928668720).

Almost surely, 2^18876988644 is an apocalyptic number.

It is an amenable number.

18876988644 is an abundant number, since it is smaller than the sum of its proper divisors (25699109916).

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

18876988644 is a wasteful number, since it uses less digits than its factorization.

18876988644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13940 (or 13938 counting only the distinct ones).

The product of its digits is 148635648, while the sum is 69.

The spelling of 18876988644 in words is "eighteen billion, eight hundred seventy-six million, nine hundred eighty-eight thousand, six hundred forty-four".