256766 has 16 divisors (see below), whose sum is σ = 421200. Its totient is φ = 116928.

The previous prime is 256757. The next prime is 256771. The reversal of 256766 is 667652.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

256766 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 7 ways as a sum of consecutive naturals, for example, 986 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (26325).

2²⁵⁶⁷⁶⁶ is an apocalyptic number.

256766 is a deficient number, since it is larger than the sum of its proper divisors (164434).

256766 is a wasteful number, since it uses less digits than its factorization.

256766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283.

The product of its digits is 15120, while the sum is 32.

The square root of 256766 is about 506.7208304382. The cubic root of 256766 is about 63.5593097056.

The spelling of 256766 in words is "two hundred fifty-six thousand, seven hundred sixty-six".