18207664 has 20 divisors (see below), whose sum is σ = 36416320. Its totient is φ = 8809920.

The previous prime is 18207653. The next prime is 18207671. The reversal of 18207664 is 46670281.

18207664 is an admirable number.

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, 17859 + ... + 18850.

It is an arithmetic number, because the mean of its divisors is an integer number (1820816).

Almost surely, 2^18207664 is an apocalyptic number.

It is an amenable number.

18207664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18207664 is a wasteful number, since it uses less digits than its factorization.

18207664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36748 (or 36742 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 18207664 is about 4267.0439416533. The cubic root of 18207664 is about 263.0781283688.

The spelling of 18207664 in words is "eighteen million, two hundred seven thousand, six hundred sixty-four".