9928715128 has 32 divisors (see below), whose sum is σ = 18853884000. Its totient is φ = 4901414272.

The previous prime is 9928715051. The next prime is 9928715129. The reversal of 9928715128 is 8215178299.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9928715129) 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, 174126 + ... + 224002.

It is an arithmetic number, because the mean of its divisors is an integer number (589183875).

Almost surely, 2^9928715128 is an apocalyptic number.

It is an amenable number.

9928715128 is a deficient number, since it is larger than the sum of its proper divisors (8925168872).

9928715128 is a wasteful number, since it uses less digits than its factorization.

9928715128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50199 (or 50195 counting only the distinct ones).

The product of its digits is 725760, while the sum is 52.

The square root of 9928715128 is about 99642.9381742630. The cubic root of 9928715128 is about 2149.3031906677.

The spelling of 9928715128 in words is "nine billion, nine hundred twenty-eight million, seven hundred fifteen thousand, one hundred twenty-eight".