78729372928 has 72 divisors (see below), whose sum is σ = 170454208680. Its totient is φ = 36145397760.

The previous prime is 78729372919. The next prime is 78729372929. The reversal of 78729372928 is 82927392787.

It can be written as a sum of positive squares in 4 ways, for example, as 311451904 + 78417921024 = 17648^2 + 280032^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 78729372928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78729372929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42183 + ... + 399046.

It is an arithmetic number, because the mean of its divisors is an integer number (2367419565).

Almost surely, 2^78729372928 is an apocalyptic number.

It is an amenable number.

78729372928 is an abundant number, since it is smaller than the sum of its proper divisors (91724835752).

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

78729372928 is a wasteful number, since it uses less digits than its factorization.

78729372928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441303 (or 441289 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 64.

The spelling of 78729372928 in words is "seventy-eight billion, seven hundred twenty-nine million, three hundred seventy-two thousand, nine hundred twenty-eight".