18215268 has 12 divisors (see below), whose sum is σ = 42502320. Its totient is φ = 6071752.

The previous prime is 18215257. The next prime is 18215291. The reversal of 18215268 is 86251281.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758958 + ... + 758981.

It is an arithmetic number, because the mean of its divisors is an integer number (3541860).

Almost surely, 2^18215268 is an apocalyptic number.

It is an amenable number.

18215268 is an abundant number, since it is smaller than the sum of its proper divisors (24287052).

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

18215268 is a wasteful number, since it uses less digits than its factorization.

18215268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517946 (or 1517944 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 18215268 is about 4267.9348636079. The cubic root of 18215268 is about 263.1147460567.

The spelling of 18215268 in words is "eighteen million, two hundred fifteen thousand, two hundred sixty-eight".