79644013 has 4 divisors (see below), whose sum is σ = 79669888. Its totient is φ = 79618140.

The previous prime is 79644007. The next prime is 79644073. The reversal of 79644013 is 31044697.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31044697 = 53 ⋅585749.

It is a cyclic number.

It is not a de Polignac number, because 79644013 - 2⁵ = 79643981 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 79644013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79644073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7581 + ... + 14722.

It is an arithmetic number, because the mean of its divisors is an integer number (19917472).

Almost surely, 2^79644013 is an apocalyptic number.

It is an amenable number.

79644013 is a deficient number, since it is larger than the sum of its proper divisors (25875).

79644013 is a wasteful number, since it uses less digits than its factorization.

79644013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25874.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 79644013 is about 8924.3494440771. The cubic root of 79644013 is about 430.2468620358.

The spelling of 79644013 in words is "seventy-nine million, six hundred forty-four thousand, thirteen".