81108 has 24 divisors (see below), whose sum is σ = 210560. Its totient is φ = 27000.

The previous prime is 81101. The next prime is 81119. The reversal of 81108 is 80118.

It is a happy number.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81108.

It is not an unprimeable number, because it can be changed into a prime (81101) by changing a digit.

81108 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 483.

2⁸¹¹⁰⁸ is an apocalyptic number.

It is an amenable number.

81108 is an abundant number, since it is smaller than the sum of its proper divisors (129452).

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 (105280).

81108 is a wasteful number, since it uses less digits than its factorization.

81108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81108 is about 284.7946628713. The cubic root of 81108 is about 43.2867085632.

Subtracting from 81108 its reverse (80118), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 8110 and 8, that added together give a palindrome (8118).

The spelling of 81108 in words is "eighty-one thousand, one hundred eight".