80728931855 has 48 divisors (see below), whose sum is σ = 115809577632. Its totient is φ = 53658528000.

The previous prime is 80728931797. The next prime is 80728931863. The reversal of 80728931855 is 55813982708.

It is a happy number.

It is not a de Polignac number, because 80728931855 - 2⁶ = 80728931791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80728931855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 743552 + ... + 845178.

It is an arithmetic number, because the mean of its divisors is an integer number (2412699534).

Almost surely, 2^80728931855 is an apocalyptic number.

80728931855 is a deficient number, since it is larger than the sum of its proper divisors (35080645777).

80728931855 is a wasteful number, since it uses less digits than its factorization.

80728931855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101768 (or 101757 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 80728931855 in words is "eighty billion, seven hundred twenty-eight million, nine hundred thirty-one thousand, eight hundred fifty-five".