256870 has 16 divisors (see below), whose sum is σ = 489888. Its totient is φ = 96640.

The previous prime is 256831. The next prime is 256873. The reversal of 256870 is 78652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (30618).

2²⁵⁶⁸⁷⁰ is an apocalyptic number.

256870 is a deficient number, since it is larger than the sum of its proper divisors (233018).

256870 is a wasteful number, since it uses less digits than its factorization.

256870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 256870 is about 506.8234406576. The cubic root of 256870 is about 63.5678898602.

The spelling of 256870 in words is "two hundred fifty-six thousand, eight hundred seventy".