9728665616 has 40 divisors (see below), whose sum is σ = 20231510904. Its totient is φ = 4515471360.

The previous prime is 9728665601. The next prime is 9728665619. The reversal of 9728665616 is 6165668279.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4615843600 + 5112822016 = 67940^2 + 71504^2 .

It is not an unprimeable number, because it can be changed into a prime (9728665619) 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, 225125 + ... + 264836.

Almost surely, 2^9728665616 is an apocalyptic number.

It is an amenable number.

9728665616 is an abundant number, since it is smaller than the sum of its proper divisors (10502845288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9728665616 is a wasteful number, since it uses less digits than its factorization.

9728665616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490059 (or 490053 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The square root of 9728665616 is about 98633.9982764564. The cubic root of 9728665616 is about 2134.7700056641.

The spelling of 9728665616 in words is "nine billion, seven hundred twenty-eight million, six hundred sixty-five thousand, six hundred sixteen".