256695 has 16 divisors (see below), whose sum is σ = 417120. Its totient is φ = 134784.

The previous prime is 256687. The next prime is 256699. The reversal of 256695 is 596652.

It is not a de Polignac number, because 256695 - 2³ = 256687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1557 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (26070).

2²⁵⁶⁶⁹⁵ is an apocalyptic number.

256695 is a deficient number, since it is larger than the sum of its proper divisors (160425).

256695 is a wasteful number, since it uses less digits than its factorization.

256695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274.

The product of its digits is 16200, while the sum is 33.

The square root of 256695 is about 506.6507672944. The cubic root of 256695 is about 63.5534507691.

The spelling of 256695 in words is "two hundred fifty-six thousand, six hundred ninety-five".