9728813 has 4 divisors (see below), whose sum is σ = 9736188. Its totient is φ = 9721440.

The previous prime is 9728801. The next prime is 9728827. The reversal of 9728813 is 3188279.

9728813 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 a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 2319529 = 2722^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 9728813 - 2⁸ = 9728557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728843) 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, 1106 + ... + 4547.

It is an arithmetic number, because the mean of its divisors is an integer number (2434047).

Almost surely, 2^9728813 is an apocalyptic number.

It is an amenable number.

9728813 is a deficient number, since it is larger than the sum of its proper divisors (7375).

9728813 is a wasteful number, since it uses less digits than its factorization.

9728813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374.

The product of its digits is 24192, while the sum is 38.

The square root of 9728813 is about 3119.1045189285. The cubic root of 9728813 is about 213.4780785812.

The spelling of 9728813 in words is "nine million, seven hundred twenty-eight thousand, eight hundred thirteen".