81812044 has 12 divisors (see below), whose sum is σ = 143245368. Its totient is φ = 40884800.

The previous prime is 81812033. The next prime is 81812051. The reversal of 81812044 is 44021818.

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, 6084 + ... + 14164.

It is an arithmetic number, because the mean of its divisors is an integer number (11937114).

Almost surely, 2^81812044 is an apocalyptic number.

It is an amenable number.

81812044 is a deficient number, since it is larger than the sum of its proper divisors (61433324).

81812044 is a wasteful number, since it uses less digits than its factorization.

81812044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616 (or 10614 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 81812044 is about 9045.0010503040. The cubic root of 81812044 is about 434.1159550573.

The spelling of 81812044 in words is "eighty-one million, eight hundred twelve thousand, forty-four".