9728008009 has 2 divisors, whose sum is σ = 9728008010. Its totient is φ = 9728008008.

The previous prime is 9728007953. The next prime is 9728008027. The reversal of 9728008009 is 9008008279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9727482384 + 525625 = 98628^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 9728008009 - 2¹¹ = 9728005961 is a prime.

It is not a weakly prime, because it can be changed into another prime (9728008109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4864004004 + 4864004005.

It is an arithmetic number, because the mean of its divisors is an integer number (4864004005).

Almost surely, 2^9728008009 is an apocalyptic number.

It is an amenable number.

9728008009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728008009 is an equidigital number, since it uses as much as digits as its factorization.

9728008009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 9728008009 is about 98630.6646484753. The cubic root of 9728008009 is about 2134.7219048115.

The spelling of 9728008009 in words is "nine billion, seven hundred twenty-eight million, eight thousand, nine".