8999564 has 12 divisors (see below), whose sum is σ = 17999184. Its totient is φ = 3856944.

The previous prime is 8999527. The next prime is 8999567. The reversal of 8999564 is 4659998.

8999564 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (8999567) 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, 160679 + ... + 160734.

It is an arithmetic number, because the mean of its divisors is an integer number (1499932).

Almost surely, 2^8999564 is an apocalyptic number.

It is an amenable number.

8999564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8999564 is a wasteful number, since it uses less digits than its factorization.

8999564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321424 (or 321422 counting only the distinct ones).

The product of its digits is 699840, while the sum is 50.

The square root of 8999564 is about 2999.9273324532. The cubic root of 8999564 is about 208.0050233008.

The spelling of 8999564 in words is "eight million, nine hundred ninety-nine thousand, five hundred sixty-four".