864565 has 16 divisors (see below), whose sum is σ = 1145088. Its totient is φ = 622656.

The previous prime is 864551. The next prime is 864581. The reversal of 864565 is 565468.

864565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 864565 - 2⁵ = 864533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 864565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2914 + ... + 3196.

It is an arithmetic number, because the mean of its divisors is an integer number (71568).

2⁸⁶⁴⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

864565 is a deficient number, since it is larger than the sum of its proper divisors (280523).

864565 is a wasteful number, since it uses less digits than its factorization.

864565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 28800, while the sum is 34.

The square root of 864565 is about 929.8198750296. The cubic root of 864565 is about 95.2648197423.

The spelling of 864565 in words is "eight hundred sixty-four thousand, five hundred sixty-five".