81105608 has 16 divisors (see below), whose sum is σ = 153906480. Its totient is φ = 40063888.

The previous prime is 81105601. The next prime is 81105631. The reversal of 81105608 is 80650118.

It is not an unprimeable number, because it can be changed into a prime (81105601) 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, 60410 + ... + 61737.

It is an arithmetic number, because the mean of its divisors is an integer number (9619155).

Almost surely, 2^81105608 is an apocalyptic number.

It is an amenable number.

81105608 is a deficient number, since it is larger than the sum of its proper divisors (72800872).

81105608 is a wasteful number, since it uses less digits than its factorization.

81105608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122236 (or 122232 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 81105608 is about 9005.8651999683. The cubic root of 81105608 is about 432.8628302837.

The spelling of 81105608 in words is "eighty-one million, one hundred five thousand, six hundred eight".