256860 has 36 divisors (see below), whose sum is σ = 779688. Its totient is φ = 68448.

The previous prime is 256831. The next prime is 256873. The reversal of 256860 is 68652.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

256860 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 534 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (21658).

2²⁵⁶⁸⁶⁰ is an apocalyptic number.

256860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256860 is an abundant number, since it is smaller than the sum of its proper divisors (522828).

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

256860 is a wasteful number, since it uses less digits than its factorization.

256860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1437 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 256860 is about 506.8135751931. The cubic root of 256860 is about 63.5670649460.

It can be divided in two parts, 2568 and 60, that added together give a triangular number (2628 = T₇₂).

The spelling of 256860 in words is "two hundred fifty-six thousand, eight hundred sixty".