9728399999 has 4 divisors (see below), whose sum is σ = 10151373936. Its totient is φ = 9305426064.

The previous prime is 9728399939. The next prime is 9728400013. The reversal of 9728399999 is 9999938279.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9728399999 - 2¹⁶ = 9728334463 is a prime.

It is a Duffinian number.

9728399999 is a modest number, since divided by 99999 gives 97283 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728399909) 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, 211486934 + ... + 211486979.

It is an arithmetic number, because the mean of its divisors is an integer number (2537843484).

Almost surely, 2^9728399999 is an apocalyptic number.

9728399999 is a deficient number, since it is larger than the sum of its proper divisors (422973937).

9728399999 is a wasteful number, since it uses less digits than its factorization.

9728399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422973936.

The product of its digits is 178564176, while the sum is 74.

The square root of 9728399999 is about 98632.6517893542. The cubic root of 9728399999 is about 2134.7505772934.

The spelling of 9728399999 in words is "nine billion, seven hundred twenty-eight million, three hundred ninety-nine thousand, nine hundred ninety-nine".