868256817 has 32 divisors (see below), whose sum is σ = 1211388288. Its totient is φ = 552738816.

The previous prime is 868256789. The next prime is 868256843. The reversal of 868256817 is 718652868.

It is not a de Polignac number, because 868256817 - 2²³ = 859868209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 868256817.

It is not an unprimeable number, because it can be changed into a prime (868256867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1289793 + ... + 1290465.

It is an arithmetic number, because the mean of its divisors is an integer number (37855884).

Almost surely, 2^868256817 is an apocalyptic number.

It is an amenable number.

868256817 is a deficient number, since it is larger than the sum of its proper divisors (343131471).

868256817 is a wasteful number, since it uses less digits than its factorization.

868256817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929.

The product of its digits is 1290240, while the sum is 51.

The square root of 868256817 is about 29466.1978714594. The cubic root of 868256817 is about 954.0022535536.

The spelling of 868256817 in words is "eight hundred sixty-eight million, two hundred fifty-six thousand, eight hundred seventeen".