18321264 has 60 divisors (see below), whose sum is σ = 55223896. Its totient is φ = 5636736.

The previous prime is 18321229. The next prime is 18321287. The reversal of 18321264 is 46212381.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3022 + ... + 6765.

Almost surely, 2^18321264 is an apocalyptic number.

It is an amenable number.

18321264 is an abundant number, since it is smaller than the sum of its proper divisors (36902632).

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

18321264 is a wasteful number, since it uses less digits than its factorization.

18321264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9814 (or 9805 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 18321264 is about 4280.3345663628. The cubic root of 18321264 is about 263.6241207301.

The spelling of 18321264 in words is "eighteen million, three hundred twenty-one thousand, two hundred sixty-four".