865568 has 24 divisors (see below), whose sum is σ = 1859760. Its totient is φ = 393280.

The previous prime is 865537. The next prime is 865577.

865568 is nontrivially palindromic in base 10.

It is an unprimeable number.

865568 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878 + ... + 1581.

It is an arithmetic number, because the mean of its divisors is an integer number (77490).

2⁸⁶⁵⁵⁶⁸ is an apocalyptic number.

865568 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

865568 is an abundant number, since it is smaller than the sum of its proper divisors (994192).

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

865568 is a wasteful number, since it uses less digits than its factorization.

865568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480 (or 2472 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 865568 is about 930.3590704669. The cubic root of 865568 is about 95.3016450775.

The spelling of 865568 in words is "eight hundred sixty-five thousand, five hundred sixty-eight".