79721308684992 has 224 divisors, whose sum is σ = 240561325799424. Its totient is φ = 23082426777600.

The previous prime is 79721308684981. The next prime is 79721308685023. The reversal of 79721308684992 is 29948680312797.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231973767 + ... + 232317177.

It is an arithmetic number, because the mean of its divisors is an integer number (1073934490176).

Almost surely, 2^{79721308684992} 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 79721308684992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120280662899712).

79721308684992 is an abundant number, since it is smaller than the sum of its proper divisors (160840017114432).

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

79721308684992 is a wasteful number, since it uses less digits than its factorization.

79721308684992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348927 (or 348917 counting only the distinct ones).

The product of its (nonzero) digits is 658409472, while the sum is 75.

The spelling of 79721308684992 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-four thousand, nine hundred ninety-two".