79985765 has 8 divisors (see below), whose sum is σ = 101629080. Its totient is φ = 60224512.

The previous prime is 79985753. The next prime is 79985767. The reversal of 79985765 is 56758997.

It can be written as a sum of positive squares in 4 ways, for example, as 12630916 + 67354849 = 3554^2 + 8207^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79985765 - 2¹² = 79981669 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79985765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79985767) 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 7 ways as a sum of consecutive naturals, for example, 470420 + ... + 470589.

It is an arithmetic number, because the mean of its divisors is an integer number (12703635).

Almost surely, 2^79985765 is an apocalyptic number.

It is an amenable number.

79985765 is a deficient number, since it is larger than the sum of its proper divisors (21643315).

79985765 is a wasteful number, since it uses less digits than its factorization.

79985765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941031.

The product of its digits is 4762800, while the sum is 56.

The square root of 79985765 is about 8943.4761139056. The cubic root of 79985765 is about 430.8613795089.

The spelling of 79985765 in words is "seventy-nine million, nine hundred eighty-five thousand, seven hundred sixty-five".