81795928752 has 60 divisors (see below), whose sum is σ = 228934305600. Its totient is φ = 27263009664.

The previous prime is 81795928729. The next prime is 81795928763. The reversal of 81795928752 is 25782959718.

It is a self number, because there is not a number n which added to its sum of digits gives 81795928752.

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 11 ways as a sum of consecutive naturals, for example, 3085249 + ... + 3111647.

It is an arithmetic number, because the mean of its divisors is an integer number (3815571760).

Almost surely, 2^81795928752 is an apocalyptic number.

It is an amenable number.

81795928752 is an abundant number, since it is smaller than the sum of its proper divisors (147138376848).

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

81795928752 is a wasteful number, since it uses less digits than its factorization.

81795928752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47930 (or 47921 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 63.

The spelling of 81795928752 in words is "eighty-one billion, seven hundred ninety-five million, nine hundred twenty-eight thousand, seven hundred fifty-two".