18320808 has 64 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 5358080.

The previous prime is 18320791. The next prime is 18320821. The reversal of 18320808 is 80802381.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6460 + ... + 8852.

It is an arithmetic number, because the mean of its divisors is an integer number (807975).

Almost surely, 2^18320808 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 18320808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855200).

18320808 is an abundant number, since it is smaller than the sum of its proper divisors (33389592).

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

18320808 is a wasteful number, since it uses less digits than its factorization.

18320808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18320808 is about 4280.2812991671. The cubic root of 18320808 is about 263.6219335885.

The spelling of 18320808 in words is "eighteen million, three hundred twenty thousand, eight hundred eight".