18090564 has 24 divisors (see below), whose sum is σ = 42288960. Its totient is φ = 6019104.

The previous prime is 18090563. The next prime is 18090607. The reversal of 18090564 is 46509081.

It is not an unprimeable number, because it can be changed into a prime (18090563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7902 + ... + 9930.

It is an arithmetic number, because the mean of its divisors is an integer number (1762040).

Almost surely, 2^18090564 is an apocalyptic number.

It is an amenable number.

18090564 is an abundant number, since it is smaller than the sum of its proper divisors (24198396).

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

18090564 is a wasteful number, since it uses less digits than its factorization.

18090564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 18090564 is about 4253.3003655985. The cubic root of 18090564 is about 262.5129317892.

The spelling of 18090564 in words is "eighteen million, ninety thousand, five hundred sixty-four".