81968876 has 24 divisors (see below), whose sum is σ = 156764160. Its totient is φ = 37192400.

The previous prime is 81968839. The next prime is 81968897. The reversal of 81968876 is 67886918.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30341 + ... + 32931.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^81968876 is an apocalyptic number.

It is an amenable number.

81968876 is a deficient number, since it is larger than the sum of its proper divisors (74795284).

81968876 is a wasteful number, since it uses less digits than its factorization.

81968876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325 (or 3323 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 81968876 is about 9053.6664396254. Note that the first 3 decimals coincide. The cubic root of 81968876 is about 434.3931751000.

The spelling of 81968876 in words is "eighty-one million, nine hundred sixty-eight thousand, eight hundred seventy-six".