9996645728 has 24 divisors (see below), whose sum is σ = 20838597192. Its totient is φ = 4704303616.

The previous prime is 9996645727. The next prime is 9996645751. The reversal of 9996645728 is 8275466999.

It is a super-2 number, since 2×9996645728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9996645727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9187550 + ... + 9188637.

It is an arithmetic number, because the mean of its divisors is an integer number (868274883).

Almost surely, 2^9996645728 is an apocalyptic number.

It is an amenable number.

9996645728 is an abundant number, since it is smaller than the sum of its proper divisors (10841951464).

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

9996645728 is a wasteful number, since it uses less digits than its factorization.

9996645728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18376214 (or 18376206 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 65.

The square root of 9996645728 is about 99983.2272333715. The cubic root of 9996645728 is about 2154.1937777618.

The spelling of 9996645728 in words is "nine billion, nine hundred ninety-six million, six hundred forty-five thousand, seven hundred twenty-eight".