8217528809 has 8 divisors (see below), whose sum is σ = 9392304960. Its totient is φ = 7042963536.

The previous prime is 8217528797. The next prime is 8217528817. The reversal of 8217528809 is 9088257128.

It is a happy number.

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

It is not a de Polignac number, because 8217528809 - 2²⁸ = 7949093353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8217528859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42182 + ... + 134960.

It is an arithmetic number, because the mean of its divisors is an integer number (1174038120).

Almost surely, 2^8217528809 is an apocalyptic number.

It is an amenable number.

8217528809 is a deficient number, since it is larger than the sum of its proper divisors (1174776151).

8217528809 is a wasteful number, since it uses less digits than its factorization.

8217528809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105439.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 8217528809 is about 90650.5863687599. The cubic root of 8217528809 is about 2017.9655372714.

The spelling of 8217528809 in words is "eight billion, two hundred seventeen million, five hundred twenty-eight thousand, eight hundred nine".