18638288840 has 64 divisors (see below), whose sum is σ = 42249634560. Its totient is φ = 7399722240.

The previous prime is 18638288833. The next prime is 18638288891. The reversal of 18638288840 is 4888283681.

It is a happy number.

It is a super-3 number, since 3×18638288840³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5696405 + ... + 5699675.

It is an arithmetic number, because the mean of its divisors is an integer number (660150540).

Almost surely, 2^18638288840 is an apocalyptic number.

18638288840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18638288840 is an abundant number, since it is smaller than the sum of its proper divisors (23611345720).

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

18638288840 is a wasteful number, since it uses less digits than its factorization.

18638288840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302 (or 4298 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 56.

The spelling of 18638288840 in words is "eighteen billion, six hundred thirty-eight million, two hundred eighty-eight thousand, eight hundred forty".