18036864 has 128 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 5640192.

The previous prime is 18036857. The next prime is 18036877. The reversal of 18036864 is 46863081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

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

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, 58599 + ... + 58905.

Almost surely, 2^18036864 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 18036864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28274400).

18036864 is an abundant number, since it is smaller than the sum of its proper divisors (38511936).

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

18036864 is a wasteful number, since it uses less digits than its factorization.

18036864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18036864 is about 4246.9829290921. The cubic root of 18036864 is about 262.2529267034.

The spelling of 18036864 in words is "eighteen million, thirty-six thousand, eight hundred sixty-four".