256810 has 16 divisors (see below), whose sum is σ = 470952. Its totient is φ = 100800.

The previous prime is 256801. The next prime is 256813. The reversal of 256810 is 18652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 208849 = 219^2 + 457^2 .

It is a super-2 number, since 2×256810² = 131902752200, which contains 22 as substring.

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

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 7 ways as a sum of consecutive naturals, for example, 400 + ... + 820.

2²⁵⁶⁸¹⁰ is an apocalyptic number.

256810 is a deficient number, since it is larger than the sum of its proper divisors (214142).

256810 is a wasteful number, since it uses less digits than its factorization.

256810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

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

The square root of 256810 is about 506.7642449897. The cubic root of 256810 is about 63.5629400537.

The spelling of 256810 in words is "two hundred fifty-six thousand, eight hundred ten".