18087636 has 24 divisors (see below), whose sum is σ = 48233920. Its totient is φ = 5167872.

The previous prime is 18087613. The next prime is 18087647. The reversal of 18087636 is 63678081.

It is a junction number, because it is equal to n+sod(n) for n = 18087594 and 18087603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107581 + ... + 107748.

Almost surely, 2^18087636 is an apocalyptic number.

It is an amenable number.

18087636 is an abundant number, since it is smaller than the sum of its proper divisors (30146284).

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

18087636 is a wasteful number, since it uses less digits than its factorization.

18087636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215343 (or 215341 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 18087636 is about 4252.9561483749. The cubic root of 18087636 is about 262.4987682482.

The spelling of 18087636 in words is "eighteen million, eighty-seven thousand, six hundred thirty-six".