8728116809 has 2 divisors, whose sum is σ = 8728116810. Its totient is φ = 8728116808.

The previous prime is 8728116799. The next prime is 8728116869. The reversal of 8728116809 is 9086118278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5859443209 + 2868673600 = 76547^2 + 53560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8728116809 is a prime.

It is not a weakly prime, because it can be changed into another prime (8728116869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4364058404 + 4364058405.

It is an arithmetic number, because the mean of its divisors is an integer number (4364058405).

Almost surely, 2^8728116809 is an apocalyptic number.

It is an amenable number.

8728116809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8728116809 is an equidigital number, since it uses as much as digits as its factorization.

8728116809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 8728116809 is about 93424.3908676958. The cubic root of 8728116809 is about 2058.9233706303.

The spelling of 8728116809 in words is "eight billion, seven hundred twenty-eight million, one hundred sixteen thousand, eight hundred nine".