79928660120089 has 27 divisors (see below), whose sum is σ = 93329388469821. Its totient is φ = 68386727946240.

The previous prime is 79928660120081. The next prime is 79928660120107. The reversal of 79928660120089 is 98002106682997.

The square root of 79928660120089 is 8940283.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4895089875225 + 75033570244864 = 2212485^2 + 8662192^2 .

It is not a de Polignac number, because 79928660120089 - 2³ = 79928660120081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79928660120081) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1671809017 + ... + 1671856825.

Almost surely, 2^{79928660120089} is an apocalyptic number.

79928660120089 is the 8940283-rd square number.

79928660120089 is the 4470142-nd centered octagonal number.

It is an amenable number.

79928660120089 is a deficient number, since it is larger than the sum of its proper divisors (13400728349732).

79928660120089 is an frugal number, since it uses more digits than its factorization.

79928660120089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95674 (or 47837 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 79928660120089 in words is "seventy-nine trillion, nine hundred twenty-eight billion, six hundred sixty million, one hundred twenty thousand, eighty-nine".