79645189 has 4 divisors (see below), whose sum is σ = 85771756. Its totient is φ = 73518624.

The previous prime is 79645183. The next prime is 79645219. The reversal of 79645189 is 98154697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98154697 = 41 ⋅2394017.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 62489025 = 4142^2 + 7905^2 .

It is a cyclic number.

It is not a de Polignac number, because 79645189 - 2⁵ = 79645157 is a prime.

It is a super-2 number, since 2×79645189² = 12686712261691442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79645183) 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, 3063264 + ... + 3063289.

It is an arithmetic number, because the mean of its divisors is an integer number (21442939).

Almost surely, 2^79645189 is an apocalyptic number.

It is an amenable number.

79645189 is a deficient number, since it is larger than the sum of its proper divisors (6126567).

79645189 is a wasteful number, since it uses less digits than its factorization.

79645189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6126566.

The product of its digits is 544320, while the sum is 49.

The square root of 79645189 is about 8924.4153309895. The cubic root of 79645189 is about 430.2489796581.

The spelling of 79645189 in words is "seventy-nine million, six hundred forty-five thousand, one hundred eighty-nine".