18085564 has 24 divisors (see below), whose sum is σ = 36528128. Its totient is φ = 7674480.

The previous prime is 18085559. The next prime is 18085597. The reversal of 18085564 is 46558081.

18085564 = 241² + 242² + ... + 408².

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, 252 + ... + 6019.

Almost surely, 2^18085564 is an apocalyptic number.

18085564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18085564 is an abundant number, since it is smaller than the sum of its proper divisors (18442564).

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

18085564 is a wasteful number, since it uses less digits than its factorization.

18085564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6385 (or 6383 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 18085564 is about 4252.7125461286. The cubic root of 18085564 is about 262.4887444909.

The spelling of 18085564 in words is "eighteen million, eighty-five thousand, five hundred sixty-four".