79907121728 has 56 divisors (see below), whose sum is σ = 187063709184. Its totient is φ = 33141196800.

The previous prime is 79907121703. The next prime is 79907121733. The reversal of 79907121728 is 82712170997.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a self number, because there is not a number n which added to its sum of digits gives 79907121728.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2862953 + ... + 2890728.

Almost surely, 2^79907121728 is an apocalyptic number.

It is an amenable number.

79907121728 is an abundant number, since it is smaller than the sum of its proper divisors (107156587456).

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

79907121728 is a wasteful number, since it uses less digits than its factorization.

79907121728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753731 (or 5753721 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 79907121728 in words is "seventy-nine billion, nine hundred seven million, one hundred twenty-one thousand, seven hundred twenty-eight".