79721740520 has 32 divisors (see below), whose sum is σ = 188814650400. Its totient is φ = 30210343488.

The previous prime is 79721740487. The next prime is 79721740537. The reversal of 79721740520 is 2504712797.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52447754 + ... + 52449273.

It is an arithmetic number, because the mean of its divisors is an integer number (5900457825).

Almost surely, 2^79721740520 is an apocalyptic number.

It is an amenable number.

79721740520 is an abundant number, since it is smaller than the sum of its proper divisors (109092909880).

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

79721740520 is a wasteful number, since it uses less digits than its factorization.

79721740520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104897057 (or 104897053 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 79721740520 in words is "seventy-nine billion, seven hundred twenty-one million, seven hundred forty thousand, five hundred twenty".