79912769 has 4 divisors (see below), whose sum is σ = 80051844. Its totient is φ = 79773696.

The previous prime is 79912759. The next prime is 79912793. The reversal of 79912769 is 96721997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42250000 + 37662769 = 6500^2 + 6137^2 .

It is a cyclic number.

It is not a de Polignac number, because 79912769 - 2⁴ = 79912753 is a prime.

It is a super-2 number, since 2×79912769² = 12772101298494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79912739) 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, 68672 + ... + 69825.

It is an arithmetic number, because the mean of its divisors is an integer number (20012961).

Almost surely, 2^79912769 is an apocalyptic number.

It is an amenable number.

79912769 is a deficient number, since it is larger than the sum of its proper divisors (139075).

79912769 is a wasteful number, since it uses less digits than its factorization.

79912769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139074.

The product of its digits is 428652, while the sum is 50.

The square root of 79912769 is about 8939.3942188495. The cubic root of 79912769 is about 430.7302698059.

The spelling of 79912769 in words is "seventy-nine million, nine hundred twelve thousand, seven hundred sixty-nine".