8256564 has 36 divisors (see below), whose sum is σ = 21971040. Its totient is φ = 2607120.

The previous prime is 8256541. The next prime is 8256569. The reversal of 8256564 is 4656528.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8256569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5352 + ... + 6719.

Almost surely, 2^8256564 is an apocalyptic number.

It is an amenable number.

8256564 is an abundant number, since it is smaller than the sum of its proper divisors (13714476).

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

8256564 is a wasteful number, since it uses less digits than its factorization.

8256564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12100 (or 12095 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 8256564 is about 2873.4237418105. The cubic root of 8256564 is about 202.1155761168.

Subtracting from 8256564 its sum of digits (36), we obtain a palindrome (8256528).

The spelling of 8256564 in words is "eight million, two hundred fifty-six thousand, five hundred sixty-four".