81256 has 16 divisors (see below), whose sum is σ = 174240. Its totient is φ = 34800.

The previous prime is 81239. The next prime is 81281. The reversal of 81256 is 65218.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (10890).

2⁸¹²⁵⁶ is an apocalyptic number.

It is an amenable number.

81256 is an abundant number, since it is smaller than the sum of its proper divisors (92984).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87120).

81256 is a wasteful number, since it uses less digits than its factorization.

81256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1460 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 81256 is about 285.0543807767. The cubic root of 81256 is about 43.3130213812.

It can be divided in two parts, 812 and 56, that added together give a palindrome (868).

The spelling of 81256 in words is "eighty-one thousand, two hundred fifty-six".