868256 has 24 divisors (see below), whose sum is σ = 1751904. Its totient is φ = 423360.

The previous prime is 868249. The next prime is 868267. The reversal of 868256 is 652868.

It is an unprimeable number.

868256 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (72996).

2⁸⁶⁸²⁵⁶ is an apocalyptic number.

868256 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 868256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875952).

868256 is an abundant number, since it is smaller than the sum of its proper divisors (883648).

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

868256 is a wasteful number, since it uses less digits than its factorization.

868256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 676 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 868256 is about 931.8025541927. The cubic root of 868256 is about 95.4001954326.

The spelling of 868256 in words is "eight hundred sixty-eight thousand, two hundred fifty-six".