9729528728 has 16 divisors (see below), whose sum is σ = 18243917280. Its totient is φ = 4864484128.

The previous prime is 9729528719. The next prime is 9729528751. The reversal of 9729528728 is 8278259279.

9729528728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234650 + ... + 272982.

It is an arithmetic number, because the mean of its divisors is an integer number (1140244830).

Almost surely, 2^9729528728 is an apocalyptic number.

It is an amenable number.

9729528728 is a deficient number, since it is larger than the sum of its proper divisors (8514388552).

9729528728 is a wasteful number, since it uses less digits than its factorization.

9729528728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70066 (or 70062 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 59.

The square root of 9729528728 is about 98638.3735064605. The cubic root of 9729528728 is about 2134.8331349494.

The spelling of 9729528728 in words is "nine billion, seven hundred twenty-nine million, five hundred twenty-eight thousand, seven hundred twenty-eight".