256688 has 20 divisors (see below), whose sum is σ = 507408. Its totient is φ = 125760.

The previous prime is 256687. The next prime is 256699. The reversal of 256688 is 886652.

256688 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256687) 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, 845 + ... + 1107.

2²⁵⁶⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

256688 is a deficient number, since it is larger than the sum of its proper divisors (250720).

256688 is a wasteful number, since it uses less digits than its factorization.

256688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 326 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 256688 is about 506.6438591358. The cubic root of 256688 is about 63.5528730690.

The spelling of 256688 in words is "two hundred fifty-six thousand, six hundred eighty-eight".