18135568 has 20 divisors (see below), whose sum is σ = 38332368. Its totient is φ = 8243360.

The previous prime is 18135547. The next prime is 18135581. The reversal of 18135568 is 86553181.

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, 51346 + ... + 51697.

Almost surely, 2^18135568 is an apocalyptic number.

It is an amenable number.

18135568 is an abundant number, since it is smaller than the sum of its proper divisors (20196800).

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

18135568 is a wasteful number, since it uses less digits than its factorization.

18135568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103062 (or 103056 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 18135568 is about 4258.5875592736. The cubic root of 18135568 is about 262.7304365024.

It can be divided in two parts, 1813 and 5568, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 18135568 in words is "eighteen million, one hundred thirty-five thousand, five hundred sixty-eight".