79825687 has 4 divisors (see below), whose sum is σ = 81983176. Its totient is φ = 77668200.

The previous prime is 79825679. The next prime is 79825717. The reversal of 79825687 is 78652897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78652897 = 17 ⋅4626641.

It is a cyclic number.

It is not a de Polignac number, because 79825687 - 2³ = 79825679 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 (79825667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078689 + ... + 1078762.

It is an arithmetic number, because the mean of its divisors is an integer number (20495794).

Almost surely, 2^79825687 is an apocalyptic number.

79825687 is a deficient number, since it is larger than the sum of its proper divisors (2157489).

79825687 is a wasteful number, since it uses less digits than its factorization.

79825687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157488.

The product of its digits is 1693440, while the sum is 52.

The square root of 79825687 is about 8934.5222032294. The cubic root of 79825687 is about 430.5737554519.

The spelling of 79825687 in words is "seventy-nine million, eight hundred twenty-five thousand, six hundred eighty-seven".