18728668 has 24 divisors (see below), whose sum is σ = 37594592. Its totient is φ = 7997184.

The previous prime is 18728653. The next prime is 18728669. The reversal of 18728668 is 86682781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728669) 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, 7696 + ... + 9832.

Almost surely, 2^18728668 is an apocalyptic number.

It is an amenable number.

18728668 is an abundant number, since it is smaller than the sum of its proper divisors (18865924).

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

18728668 is a wasteful number, since it uses less digits than its factorization.

18728668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461 (or 2459 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 18728668 is about 4327.6631107331. The cubic root of 18728668 is about 265.5638545855.

The spelling of 18728668 in words is "eighteen million, seven hundred twenty-eight thousand, six hundred sixty-eight".