81168944 has 20 divisors (see below), whose sum is σ = 158794896. Its totient is φ = 40189632.

The previous prime is 81168929. The next prime is 81168961. The reversal of 81168944 is 44986118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22979 + ... + 26274.

Almost surely, 2^81168944 is an apocalyptic number.

It is an amenable number.

81168944 is a deficient number, since it is larger than the sum of its proper divisors (77625952).

81168944 is a wasteful number, since it uses less digits than its factorization.

81168944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49364 (or 49358 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 81168944 is about 9009.3808888292. The cubic root of 81168944 is about 432.9754762836.

The spelling of 81168944 in words is "eighty-one million, one hundred sixty-eight thousand, nine hundred forty-four".