81456 has 20 divisors (see below), whose sum is σ = 210552. Its totient is φ = 27136.

The previous prime is 81439. The next prime is 81457. The reversal of 81456 is 65418.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is not an unprimeable number, because it can be changed into a prime (81457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801 + ... + 896.

2⁸¹⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

81456 is an abundant number, since it is smaller than the sum of its proper divisors (129096).

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 (105276).

81456 is a wasteful number, since it uses less digits than its factorization.

81456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708 (or 1702 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 81456 is about 285.4049754297. The cubic root of 81456 is about 43.3485285304.

The spelling of 81456 in words is "eighty-one thousand, four hundred fifty-six".