256812 has 12 divisors (see below), whose sum is σ = 599256. Its totient is φ = 85600.

The previous prime is 256801. The next prime is 256813. The reversal of 256812 is 218652.

256812 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256812.

It is not an unprimeable number, because it can be changed into a prime (256813) by changing a digit.

256812 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, 10689 + ... + 10712.

It is an arithmetic number, because the mean of its divisors is an integer number (49938).

2²⁵⁶⁸¹² is an apocalyptic number.

It is an amenable number.

256812 is an abundant number, since it is smaller than the sum of its proper divisors (342444).

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

256812 is a wasteful number, since it uses less digits than its factorization.

256812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21408 (or 21406 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 256812 is about 506.7662182901. The cubic root of 256812 is about 63.5631050597.

The spelling of 256812 in words is "two hundred fifty-six thousand, eight hundred twelve".