79785734820 has 48 divisors (see below), whose sum is σ = 243709155648. Its totient is φ = 19341996160.

The previous prime is 79785734801. The next prime is 79785734827. The reversal of 79785734820 is 2843758797.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (79785734827) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 60443079 + ... + 60444398.

It is an arithmetic number, because the mean of its divisors is an integer number (5077274076).

Almost surely, 2^79785734820 is an apocalyptic number.

It is an amenable number.

79785734820 is an abundant number, since it is smaller than the sum of its proper divisors (163923420828).

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

79785734820 is a wasteful number, since it uses less digits than its factorization.

79785734820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120887500 (or 120887498 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 60.

The spelling of 79785734820 in words is "seventy-nine billion, seven hundred eighty-five million, seven hundred thirty-four thousand, eight hundred twenty".