9728665959 has 8 divisors (see below), whose sum is σ = 12972543232. Its totient is φ = 6485283000.

The previous prime is 9728665949. The next prime is 9728665967. The reversal of 9728665959 is 9595668279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9728665959 - 2¹¹ = 9728663911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9728665959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728665949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74917 + ... + 158334.

It is an arithmetic number, because the mean of its divisors is an integer number (1621567904).

Almost surely, 2^9728665959 is an apocalyptic number.

9728665959 is a deficient number, since it is larger than the sum of its proper divisors (3243877273).

9728665959 is a wasteful number, since it uses less digits than its factorization.

9728665959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247157.

The product of its digits is 73483200, while the sum is 66.

The square root of 9728665959 is about 98634.0000152077. Note that the first 4 decimals coincide. The cubic root of 9728665959 is about 2134.7700307523.

The spelling of 9728665959 in words is "nine billion, seven hundred twenty-eight million, six hundred sixty-five thousand, nine hundred fifty-nine".