81104 has 20 divisors (see below), whose sum is σ = 162564. Its totient is φ = 39168.

The previous prime is 81101. The next prime is 81119. The reversal of 81104 is 40118.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61504 + 19600 = 248^2 + 140^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81101) 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, 524 + ... + 660.

2⁸¹¹⁰⁴ is an apocalyptic number.

It is an amenable number.

81104 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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 (81282).

81104 is a wasteful number, since it uses less digits than its factorization.

81104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 81104 is about 284.7876401812. The cubic root of 81104 is about 43.2859969618.

Adding to 81104 its sum of digits (14), we get a palindrome (81118).

The spelling of 81104 in words is "eighty-one thousand, one hundred four".