18660864 has 40 divisors (see below), whose sum is σ = 49717800. Its totient is φ = 6219776.

The previous prime is 18660857. The next prime is 18660893. The reversal of 18660864 is 46806681.

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, 4539 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (1242945).

Almost surely, 2^18660864 is an apocalyptic number.

It is an amenable number.

18660864 is an abundant number, since it is smaller than the sum of its proper divisors (31056936).

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

18660864 is an equidigital number, since it uses as much as digits as its factorization.

18660864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12170 (or 12154 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 18660864 is about 4319.8222185641. The cubic root of 18660864 is about 265.2429906032.

The spelling of 18660864 in words is "eighteen million, six hundred sixty thousand, eight hundred sixty-four".