79745879 has 4 divisors (see below), whose sum is σ = 80936184. Its totient is φ = 78555576.

The previous prime is 79745873. The next prime is 79745891. The reversal of 79745879 is 97854797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97854797 = 61 ⋅1604177.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79745879 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 (79745873) 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, 595052 + ... + 595185.

It is an arithmetic number, because the mean of its divisors is an integer number (20234046).

Almost surely, 2^79745879 is an apocalyptic number.

79745879 is a deficient number, since it is larger than the sum of its proper divisors (1190305).

79745879 is a wasteful number, since it uses less digits than its factorization.

79745879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190304.

The product of its digits is 4445280, while the sum is 56.

The square root of 79745879 is about 8930.0548150613. The cubic root of 79745879 is about 430.4302148206.

The spelling of 79745879 in words is "seventy-nine million, seven hundred forty-five thousand, eight hundred seventy-nine".