18005664 has 24 divisors (see below), whose sum is σ = 47265120. Its totient is φ = 6001856.

The previous prime is 18005657. The next prime is 18005681. The reversal of 18005664 is 46650081.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93684 + ... + 93875.

It is an arithmetic number, because the mean of its divisors is an integer number (1969380).

Almost surely, 2^18005664 is an apocalyptic number.

It is an amenable number.

18005664 is an abundant number, since it is smaller than the sum of its proper divisors (29259456).

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

18005664 is a wasteful number, since it uses less digits than its factorization.

18005664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187572 (or 187564 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 18005664 is about 4243.3081434183. The cubic root of 18005664 is about 262.1016252034.

The spelling of 18005664 in words is "eighteen million, five thousand, six hundred sixty-four".