18872688 has 20 divisors (see below), whose sum is σ = 48754568. Its totient is φ = 6290880.

The previous prime is 18872677. The next prime is 18872753. The reversal of 18872688 is 88627881.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 393181 = 18872688 / (1 + 8 + 8 + 7 + 2 + 6 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196543 + ... + 196638.

Almost surely, 2^18872688 is an apocalyptic number.

It is an amenable number.

18872688 is an abundant number, since it is smaller than the sum of its proper divisors (29881880).

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

18872688 is a wasteful number, since it uses less digits than its factorization.

18872688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393192 (or 393186 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 18872688 is about 4344.2707097970. The cubic root of 18872688 is about 266.2428294924.

The spelling of 18872688 in words is "eighteen million, eight hundred seventy-two thousand, six hundred eighty-eight".