80728072816 has 20 divisors (see below), whose sum is σ = 156440433600. Its totient is φ = 40356348032.

The previous prime is 80728072783. The next prime is 80728072819. The reversal of 80728072816 is 61827082708.

It is a self number, because there is not a number n which added to its sum of digits gives 80728072816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80728072819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393421 + ... + 562348.

It is an arithmetic number, because the mean of its divisors is an integer number (7822021680).

Almost surely, 2^80728072816 is an apocalyptic number.

It is an amenable number.

80728072816 is a deficient number, since it is larger than the sum of its proper divisors (75712360784).

80728072816 is a wasteful number, since it uses less digits than its factorization.

80728072816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961056 (or 961050 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 80728072816 in words is "eighty billion, seven hundred twenty-eight million, seventy-two thousand, eight hundred sixteen".