81108368 has 20 divisors (see below), whose sum is σ = 171433968. Its totient is φ = 36867360.

The previous prime is 81108361. The next prime is 81108383. The reversal of 81108368 is 86380118.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (81108361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230246 + ... + 230597.

Almost surely, 2^81108368 is an apocalyptic number.

81108368 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81108368 is an abundant number, since it is smaller than the sum of its proper divisors (90325600).

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

81108368 is a wasteful number, since it uses less digits than its factorization.

81108368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460862 (or 460856 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 81108368 is about 9006.0184321375. The cubic root of 81108368 is about 432.8677402930.

The spelling of 81108368 in words is "eighty-one million, one hundred eight thousand, three hundred sixty-eight".