18078268 has 36 divisors (see below), whose sum is σ = 35048160. Its totient is φ = 8151936.

The previous prime is 18078257. The next prime is 18078287. The reversal of 18078268 is 86287081.

It is a self number, because there is not a number n which added to its sum of digits gives 18078268.

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, 31488 + ... + 32056.

It is an arithmetic number, because the mean of its divisors is an integer number (973560).

Almost surely, 2^18078268 is an apocalyptic number.

It is an amenable number.

18078268 is a deficient number, since it is larger than the sum of its proper divisors (16969892).

18078268 is a wasteful number, since it uses less digits than its factorization.

18078268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 18078268 is about 4251.8546541480. The cubic root of 18078268 is about 262.4534423854.

The spelling of 18078268 in words is "eighteen million, seventy-eight thousand, two hundred sixty-eight".