256662 has 48 divisors (see below), whose sum is σ = 670320. Its totient is φ = 72576.

The previous prime is 256661. The next prime is 256687. The reversal of 256662 is 266652.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256661) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2598 + ... + 2694.

It is an arithmetic number, because the mean of its divisors is an integer number (13965).

2²⁵⁶⁶⁶² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335160).

256662 is an abundant number, since it is smaller than the sum of its proper divisors (413658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256662 is a wasteful number, since it uses less digits than its factorization.

256662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 109 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 256662 is about 506.6181994362. The cubic root of 256662 is about 63.5507272338.

It can be divided in two parts, 2566 and 62, that added together give a triangular number (2628 = T₇₂).

The spelling of 256662 in words is "two hundred fifty-six thousand, six hundred sixty-two".