9728997825 has 12 divisors (see below), whose sum is σ = 16085276528. Its totient is φ = 5188798800.

The previous prime is 9728997757. The next prime is 9728997827. The reversal of 9728997825 is 5287998279.

It is not a de Polignac number, because 9728997825 - 2²⁰ = 9727949249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9728997827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64859911 + ... + 64860060.

Almost surely, 2^9728997825 is an apocalyptic number.

It is an amenable number.

9728997825 is a deficient number, since it is larger than the sum of its proper divisors (6356278703).

9728997825 is a wasteful number, since it uses less digits than its factorization.

9728997825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129719984 (or 129719979 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 66.

The square root of 9728997825 is about 98635.6823112204. The cubic root of 9728997825 is about 2134.7943043625.

The spelling of 9728997825 in words is "nine billion, seven hundred twenty-eight million, nine hundred ninety-seven thousand, eight hundred twenty-five".