18690564 has 12 divisors (see below), whose sum is σ = 43611344. Its totient is φ = 6230184.

The previous prime is 18690563. The next prime is 18690569. The reversal of 18690564 is 46509681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18690563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778762 + ... + 778785.

Almost surely, 2^18690564 is an apocalyptic number.

It is an amenable number.

18690564 is an abundant number, since it is smaller than the sum of its proper divisors (24920780).

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

18690564 is a wasteful number, since it uses less digits than its factorization.

18690564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557554 (or 1557552 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 18690564 is about 4323.2584933127. The cubic root of 18690564 is about 265.3836332731.

The spelling of 18690564 in words is "eighteen million, six hundred ninety thousand, five hundred sixty-four".