79784645604820 has 96 divisors (see below), whose sum is σ = 181827974313216. Its totient is φ = 29231728281600.

The previous prime is 79784645604791. The next prime is 79784645604857. The reversal of 79784645604820 is 2840654648797.

It is a self number, because there is not a number n which added to its sum of digits gives 79784645604820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458258385 + ... + 458432455.

It is an arithmetic number, because the mean of its divisors is an integer number (1894041399096).

Almost surely, 2^{79784645604820} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79784645604820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90913987156608).

79784645604820 is an abundant number, since it is smaller than the sum of its proper divisors (102043328708396).

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

79784645604820 is a wasteful number, since it uses less digits than its factorization.

79784645604820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187681 (or 187679 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 70.

The spelling of 79784645604820 in words is "seventy-nine trillion, seven hundred eighty-four billion, six hundred forty-five million, six hundred four thousand, eight hundred twenty".