18656868 has 12 divisors (see below), whose sum is σ = 43532720. Its totient is φ = 6218952.

The previous prime is 18656867. The next prime is 18656873. The reversal of 18656868 is 86865681.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18656867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777358 + ... + 777381.

Almost surely, 2^18656868 is an apocalyptic number.

It is an amenable number.

18656868 is an abundant number, since it is smaller than the sum of its proper divisors (24875852).

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

18656868 is a wasteful number, since it uses less digits than its factorization.

18656868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554746 (or 1554744 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The square root of 18656868 is about 4319.3596747666. The cubic root of 18656868 is about 265.2240563842.

The spelling of 18656868 in words is "eighteen million, six hundred fifty-six thousand, eight hundred sixty-eight".