79440005 has 4 divisors (see below), whose sum is σ = 95328012. Its totient is φ = 63552000.

The previous prime is 79439977. The next prime is 79440037. The reversal of 79440005 is 50004497.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13082689 + 66357316 = 3617^2 + 8146^2 .

It is not a de Polignac number, because 79440005 - 2⁸ = 79439749 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 79440005.

It is a congruent number.

It is an unprimeable number.

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, 7943996 + ... + 7944005.

It is an arithmetic number, because the mean of its divisors is an integer number (23832003).

Almost surely, 2^79440005 is an apocalyptic number.

It is an amenable number.

79440005 is a deficient number, since it is larger than the sum of its proper divisors (15888007).

79440005 is a wasteful number, since it uses less digits than its factorization.

79440005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15888006.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 79440005 is about 8912.9122625548. The cubic root of 79440005 is about 429.8791890641.

The spelling of 79440005 in words is "seventy-nine million, four hundred forty thousand, five".