81186796 has 24 divisors (see below), whose sum is σ = 144619776. Its totient is φ = 39871440.

The previous prime is 81186751. The next prime is 81186821. The reversal of 81186796 is 69768118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138015 + ... + 138601.

It is an arithmetic number, because the mean of its divisors is an integer number (6025824).

Almost surely, 2^81186796 is an apocalyptic number.

It is an amenable number.

81186796 is a deficient number, since it is larger than the sum of its proper divisors (63432980).

81186796 is a wasteful number, since it uses less digits than its factorization.

81186796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1147 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 81186796 is about 9010.3715794633. The cubic root of 81186796 is about 433.0072163031.

The spelling of 81186796 in words is "eighty-one million, one hundred eighty-six thousand, seven hundred ninety-six".