256366 has 16 divisors (see below), whose sum is σ = 430848. Its totient is φ = 113400.

The previous prime is 256363. The next prime is 256369. The reversal of 256366 is 663652.

It is an interprime number because it is at equal distance from previous prime (256363) and next prime (256369).

It is a d-powerful number, because it can be written as 2¹⁷ + 5⁷ + 3⁴ + 6³ + 6³ + 6⁶ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256363) 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, 811 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (26928).

2²⁵⁶³⁶⁶ is an apocalyptic number.

256366 is the 271-st nonagonal number.

256366 is a deficient number, since it is larger than the sum of its proper divisors (174482).

256366 is a wasteful number, since it uses less digits than its factorization.

256366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its digits is 6480, while the sum is 28.

The square root of 256366 is about 506.3259819523. The cubic root of 256366 is about 63.5262875020.

The spelling of 256366 in words is "two hundred fifty-six thousand, three hundred sixty-six".