81795 has 32 divisors (see below), whose sum is σ = 161280. Its totient is φ = 34560.

The previous prime is 81773. The next prime is 81799. The reversal of 81795 is 59718.

It is a Cunningham number, because it is equal to 286²-1.

It is not a de Polignac number, because 81795 - 2⁷ = 81667 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1975 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (5040).

2⁸¹⁷⁹⁵ is an apocalyptic number.

81795 is a deficient number, since it is larger than the sum of its proper divisors (79485).

81795 is a wasteful number, since it uses less digits than its factorization.

81795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75.

The product of its digits is 2520, while the sum is 30.

The square root of 81795 is about 285.9982517429. The cubic root of 81795 is about 43.4085806333.

The spelling of 81795 in words is "eighty-one thousand, seven hundred ninety-five".