81204928044 has 24 divisors (see below), whose sum is σ = 189505541568. Its totient is φ = 27064398480.

The previous prime is 81204928019. The next prime is 81204928097. The reversal of 81204928044 is 44082940218.

It is a junction number, because it is equal to n+sod(n) for n = 81204927987 and 81204928005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401722 + ... + 569025.

It is an arithmetic number, because the mean of its divisors is an integer number (7896064232).

Almost surely, 2^81204928044 is an apocalyptic number.

It is an amenable number.

81204928044 is an abundant number, since it is smaller than the sum of its proper divisors (108300613524).

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

81204928044 is a wasteful number, since it uses less digits than its factorization.

81204928044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977725 (or 977723 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The spelling of 81204928044 in words is "eighty-one billion, two hundred four million, nine hundred twenty-eight thousand, forty-four".