81364044 has 24 divisors (see below), whose sum is σ = 190003968. Its totient is φ = 27099280.

The previous prime is 81364043. The next prime is 81364051. The reversal of 81364044 is 44046318.

It is not an unprimeable number, because it can be changed into a prime (81364043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20329 + ... + 23999.

It is an arithmetic number, because the mean of its divisors is an integer number (7916832).

Almost surely, 2^81364044 is an apocalyptic number.

It is an amenable number.

81364044 is an abundant number, since it is smaller than the sum of its proper divisors (108639924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81364044 is a wasteful number, since it uses less digits than its factorization.

81364044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5525 (or 5523 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 81364044 is about 9020.2019933037. The cubic root of 81364044 is about 433.3221027990.

The spelling of 81364044 in words is "eighty-one million, three hundred sixty-four thousand, forty-four".