81968944 has 20 divisors (see below), whose sum is σ = 159771024. Its totient is φ = 40737728.

The previous prime is 81968903. The next prime is 81968989. The reversal of 81968944 is 44986918.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12667 + ... + 18010.

Almost surely, 2^81968944 is an apocalyptic number.

It is an amenable number.

81968944 is a deficient number, since it is larger than the sum of its proper divisors (77802080).

81968944 is a wasteful number, since it uses less digits than its factorization.

81968944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30852 (or 30846 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 81968944 is about 9053.6701950093. The cubic root of 81968944 is about 434.3932952217.

The spelling of 81968944 in words is "eighty-one million, nine hundred sixty-eight thousand, nine hundred forty-four".