9728994899 has 4 divisors (see below), whose sum is σ = 10477379136. Its totient is φ = 8980610664.

The previous prime is 9728994851. The next prime is 9728994901. The reversal of 9728994899 is 9984998279.

9728994899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9984998279 = 72643 ⋅137453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9728994899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9728994199) by changing a digit.

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, 374192099 + ... + 374192124.

It is an arithmetic number, because the mean of its divisors is an integer number (2619344784).

Almost surely, 2^9728994899 is an apocalyptic number.

9728994899 is a deficient number, since it is larger than the sum of its proper divisors (748384237).

9728994899 is a wasteful number, since it uses less digits than its factorization.

9728994899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748384236.

The product of its digits is 211631616, while the sum is 74.

The square root of 9728994899 is about 98635.6674788588. The cubic root of 9728994899 is about 2134.7940903491.

The spelling of 9728994899 in words is "nine billion, seven hundred twenty-eight million, nine hundred ninety-four thousand, eight hundred ninety-nine".