79404565 has 4 divisors (see below), whose sum is σ = 95285484. Its totient is φ = 63523648.

The previous prime is 79404551. The next prime is 79404571. The reversal of 79404565 is 56540497.

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 13972644 + 65431921 = 3738^2 + 8089^2 .

It is a cyclic number.

It is not a de Polignac number, because 79404565 - 2⁹ = 79404053 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7940452 + ... + 7940461.

It is an arithmetic number, because the mean of its divisors is an integer number (23821371).

Almost surely, 2^79404565 is an apocalyptic number.

It is an amenable number.

79404565 is a deficient number, since it is larger than the sum of its proper divisors (15880919).

79404565 is a wasteful number, since it uses less digits than its factorization.

79404565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15880918.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 79404565 is about 8910.9239139384. The cubic root of 79404565 is about 429.8152532483.

The spelling of 79404565 in words is "seventy-nine million, four hundred four thousand, five hundred sixty-five".