82805009 has 4 divisors (see below), whose sum is σ = 94634304. Its totient is φ = 70975716.

The previous prime is 82805003. The next prime is 82805039. The reversal of 82805009 is 90050828.

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 not a de Polignac number, because 82805009 - 2⁸ = 82804753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82805003) 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, 5914637 + ... + 5914650.

It is an arithmetic number, because the mean of its divisors is an integer number (23658576).

Almost surely, 2^82805009 is an apocalyptic number.

It is an amenable number.

82805009 is a deficient number, since it is larger than the sum of its proper divisors (11829295).

82805009 is a wasteful number, since it uses less digits than its factorization.

82805009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11829294.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 82805009 is about 9099.7257650986. The cubic root of 82805009 is about 435.8652071186.

The spelling of 82805009 in words is "eighty-two million, eight hundred five thousand, nine".