18208564 has 36 divisors (see below), whose sum is σ = 37102212. Its totient is φ = 7786240.

The previous prime is 18208543. The next prime is 18208573. The reversal of 18208564 is 46580281.

It can be written as a sum of positive squares in 2 ways, for example, as 16744464 + 1464100 = 4092^2 + 1210^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 7122 + ... + 9334.

It is an arithmetic number, because the mean of its divisors is an integer number (1030617).

Almost surely, 2^18208564 is an apocalyptic number.

It is an amenable number.

18208564 is an abundant number, since it is smaller than the sum of its proper divisors (18893648).

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

18208564 is a wasteful number, since it uses less digits than its factorization.

18208564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2243 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 18208564 is about 4267.1493997750. The cubic root of 18208564 is about 263.0824629248.

The spelling of 18208564 in words is "eighteen million, two hundred eight thousand, five hundred sixty-four".