79691825 has 12 divisors (see below), whose sum is σ = 99249228. Its totient is φ = 63475200.

The previous prime is 79691813. The next prime is 79691827. The reversal of 79691825 is 52819697.

79691825 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 6 ways, for example, as 107584 + 79584241 = 328^2 + 8921^2 .

It is not a de Polignac number, because 79691825 - 2⁴ = 79691809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79691825.

It is not an unprimeable number, because it can be changed into a prime (79691827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1016 + ... + 12665.

It is an arithmetic number, because the mean of its divisors is an integer number (8270769).

Almost surely, 2^79691825 is an apocalyptic number.

It is an amenable number.

79691825 is a deficient number, since it is larger than the sum of its proper divisors (19557403).

79691825 is a wasteful number, since it uses less digits than its factorization.

79691825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924 (or 13919 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 79691825 is about 8927.0277808462. The cubic root of 79691825 is about 430.3329402697.

The spelling of 79691825 in words is "seventy-nine million, six hundred ninety-one thousand, eight hundred twenty-five".