9728897165 has 16 divisors (see below), whose sum is σ = 12575318448. Its totient is φ = 7182936576.

The previous prime is 9728897149. The next prime is 9728897201. The reversal of 9728897165 is 5617988279.

It can be written as a sum of positive squares in 8 ways, for example, as 123721129 + 9605176036 = 11123^2 + 98006^2 .

It is a cyclic number.

It is not a de Polignac number, because 9728897165 - 2⁴ = 9728897149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9728897098 and 9728897107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380009 + ... + 404801.

It is an arithmetic number, because the mean of its divisors is an integer number (785957403).

Almost surely, 2^9728897165 is an apocalyptic number.

It is an amenable number.

9728897165 is a deficient number, since it is larger than the sum of its proper divisors (2846421283).

9728897165 is a wasteful number, since it uses less digits than its factorization.

9728897165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30848.

The product of its digits is 15240960, while the sum is 62.

The square root of 9728897165 is about 98635.1720483114. The cubic root of 9728897165 is about 2134.7869418661.

The spelling of 9728897165 in words is "nine billion, seven hundred twenty-eight million, eight hundred ninety-seven thousand, one hundred sixty-five".