810256 has 20 divisors (see below), whose sum is σ = 1590300. Its totient is φ = 399872.

The previous prime is 810253. The next prime is 810259. The reversal of 810256 is 652018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (810253) and next prime (810259).

It can be written as a sum of positive squares in 2 ways, for example, as 144400 + 665856 = 380^2 + 816^2 .

It is not an unprimeable number, because it can be changed into a prime (810253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (79515).

2⁸¹⁰²⁵⁶ is an apocalyptic number.

It is an amenable number.

810256 is a deficient number, since it is larger than the sum of its proper divisors (780044).

810256 is a wasteful number, since it uses less digits than its factorization.

810256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 810256 is about 900.1422109867. The cubic root of 810256 is about 93.2267945334.

The spelling of 810256 in words is "eight hundred ten thousand, two hundred fifty-six".