256580 has 12 divisors (see below), whose sum is σ = 538860. Its totient is φ = 102624.

The previous prime is 256579. The next prime is 256589. The reversal of 256580 is 85652.

256580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 107584 = 386^2 + 328^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (256589) 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, 6395 + ... + 6434.

It is an arithmetic number, because the mean of its divisors is an integer number (44905).

2²⁵⁶⁵⁸⁰ is an apocalyptic number.

256580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256580 is an abundant number, since it is smaller than the sum of its proper divisors (282280).

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

256580 is a wasteful number, since it uses less digits than its factorization.

256580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838 (or 12836 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 256580 is about 506.5372641771. The cubic root of 256580 is about 63.5439586500.

The spelling of 256580 in words is "two hundred fifty-six thousand, five hundred eighty".