18108864 has 84 divisors (see below), whose sum is σ = 52501800. Its totient is φ = 5967360.

The previous prime is 18108841. The next prime is 18108907. The reversal of 18108864 is 46880181.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85719 + ... + 85929.

Almost surely, 2^18108864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18108864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26250900).

18108864 is an abundant number, since it is smaller than the sum of its proper divisors (34392936).

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

18108864 is a wasteful number, since it uses less digits than its factorization.

18108864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18108864 is about 4255.4510924225. The cubic root of 18108864 is about 262.6014193141.

The spelling of 18108864 in words is "eighteen million, one hundred eight thousand, eight hundred sixty-four".