864564 has 12 divisors (see below), whose sum is σ = 2017344. Its totient is φ = 288184.

The previous prime is 864551. The next prime is 864581. The reversal of 864564 is 465468.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36012 + ... + 36035.

It is an arithmetic number, because the mean of its divisors is an integer number (168112).

2⁸⁶⁴⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

864564 is an abundant number, since it is smaller than the sum of its proper divisors (1152780).

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

864564 is a wasteful number, since it uses less digits than its factorization.

864564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72054 (or 72052 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 864564 is about 929.8193372909. The cubic root of 864564 is about 95.2647830129.

The spelling of 864564 in words is "eight hundred sixty-four thousand, five hundred sixty-four".