79445809 has 4 divisors (see below), whose sum is σ = 79463920. Its totient is φ = 79427700.

The previous prime is 79445803. The next prime is 79445831. The reversal of 79445809 is 90854497.

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.

It is a cyclic number.

It is not a de Polignac number, because 79445809 - 2¹¹ = 79443761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79445803) 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, 2134 + ... + 12784.

It is an arithmetic number, because the mean of its divisors is an integer number (19865980).

Almost surely, 2^79445809 is an apocalyptic number.

It is an amenable number.

79445809 is a deficient number, since it is larger than the sum of its proper divisors (18111).

79445809 is a wasteful number, since it uses less digits than its factorization.

79445809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18110.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 79445809 is about 8913.2378516452. The cubic root of 79445809 is about 429.8896580046.

The spelling of 79445809 in words is "seventy-nine million, four hundred forty-five thousand, eight hundred nine".