81974044 has 24 divisors (see below), whose sum is σ = 150183936. Its totient is φ = 39102000.

The previous prime is 81974041. The next prime is 81974071. The reversal of 81974044 is 44047918.

It is a junction number, because it is equal to n+sod(n) for n = 81973994 and 81974012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81974041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4149 + ... + 13459.

It is an arithmetic number, because the mean of its divisors is an integer number (6257664).

Almost surely, 2^81974044 is an apocalyptic number.

It is an amenable number.

81974044 is a deficient number, since it is larger than the sum of its proper divisors (68209892).

81974044 is a wasteful number, since it uses less digits than its factorization.

81974044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9417 (or 9415 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 81974044 is about 9053.9518443606. The cubic root of 81974044 is about 434.4023041616.

The spelling of 81974044 in words is "eighty-one million, nine hundred seventy-four thousand, forty-four".