82809209 has 8 divisors (see below), whose sum is σ = 94774080. Its totient is φ = 70878096.

The previous prime is 82809197. The next prime is 82809263. The reversal of 82809209 is 90290828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82809209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82809289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2939 + ... + 13200.

It is an arithmetic number, because the mean of its divisors is an integer number (11846760).

Almost surely, 2^82809209 is an apocalyptic number.

It is an amenable number.

82809209 is a deficient number, since it is larger than the sum of its proper divisors (11964871).

82809209 is a wasteful number, since it uses less digits than its factorization.

82809209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16879.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 82809209 is about 9099.9565383578. The cubic root of 82809209 is about 435.8725762498.

The spelling of 82809209 in words is "eighty-two million, eight hundred nine thousand, two hundred nine".