256286 has 8 divisors (see below), whose sum is σ = 387840. Its totient is φ = 127008.

The previous prime is 256279. The next prime is 256301. The reversal of 256286 is 682652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

256286 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251 + ... + 758.

It is an arithmetic number, because the mean of its divisors is an integer number (48480).

2²⁵⁶²⁸⁶ is an apocalyptic number.

256286 is a deficient number, since it is larger than the sum of its proper divisors (131554).

256286 is a wasteful number, since it uses less digits than its factorization.

256286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138.

The product of its digits is 5760, while the sum is 29.

The square root of 256286 is about 506.2469752996. The cubic root of 256286 is about 63.5196789401.

The spelling of 256286 in words is "two hundred fifty-six thousand, two hundred eighty-six".