18506664 has 64 divisors (see below), whose sum is σ = 56088000. Its totient is φ = 5607360.

The previous prime is 18506639. The next prime is 18506671. The reversal of 18506664 is 46660581.

It is a super-2 number, since 2×18506664² = 684993224817792, which contains 22 as substring.

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

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 15 ways as a sum of consecutive naturals, for example, 1519 + ... + 6270.

It is an arithmetic number, because the mean of its divisors is an integer number (876375).

Almost surely, 2^18506664 is an apocalyptic number.

It is an amenable number.

18506664 is an abundant number, since it is smaller than the sum of its proper divisors (37581336).

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

18506664 is a wasteful number, since it uses less digits than its factorization.

18506664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815 (or 7805 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 18506664 is about 4301.9372380359. The cubic root of 18506664 is about 264.5103763188.

The spelling of 18506664 in words is "eighteen million, five hundred six thousand, six hundred sixty-four".