79870013 has 4 divisors (see below), whose sum is σ = 82028700. Its totient is φ = 77711328.

The previous prime is 79870003. The next prime is 79870019. The reversal of 79870013 is 31007897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31007897 = 293 ⋅105829.

It can be written as a sum of positive squares in 2 ways, for example, as 57183844 + 22686169 = 7562^2 + 4763^2 .

It is a cyclic number.

It is not a de Polignac number, because 79870013 - 2⁴ = 79869997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79870019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079288 + ... + 1079361.

It is an arithmetic number, because the mean of its divisors is an integer number (20507175).

Almost surely, 2^79870013 is an apocalyptic number.

It is an amenable number.

79870013 is a deficient number, since it is larger than the sum of its proper divisors (2158687).

79870013 is a wasteful number, since it uses less digits than its factorization.

79870013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158686.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 79870013 is about 8937.0024616758. The cubic root of 79870013 is about 430.6534377423.

The spelling of 79870013 in words is "seventy-nine million, eight hundred seventy thousand, thirteen".