79720068389520 has 640 divisors, whose sum is σ = 274418455094784. Its totient is φ = 19017561341952.

The previous prime is 79720068389461. The next prime is 79720068389573. The reversal of 79720068389520 is 2598386002797.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 41672800084 + ... + 41672801996.

Almost surely, 2^{79720068389520} 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 79720068389520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137209227547392).

79720068389520 is an abundant number, since it is smaller than the sum of its proper divisors (194698386705264).

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

79720068389520 is a wasteful number, since it uses less digits than its factorization.

79720068389520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219 (or 3213 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 66.

The spelling of 79720068389520 in words is "seventy-nine trillion, seven hundred twenty billion, sixty-eight million, three hundred eighty-nine thousand, five hundred twenty".