9975728 has 20 divisors (see below), whose sum is σ = 22089360. Its totient is φ = 4275264.

The previous prime is 9975727. The next prime is 9975733. The reversal of 9975728 is 8275799.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9975727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44423 + ... + 44646.

It is an arithmetic number, because the mean of its divisors is an integer number (1104468).

Almost surely, 2^9975728 is an apocalyptic number.

It is an amenable number.

9975728 is an abundant number, since it is smaller than the sum of its proper divisors (12113632).

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

9975728 is a wasteful number, since it uses less digits than its factorization.

9975728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89084 (or 89078 counting only the distinct ones).

The product of its digits is 317520, while the sum is 47.

The square root of 9975728 is about 3158.4375884288. The cubic root of 9975728 is about 215.2690196565.

The spelling of 9975728 in words is "nine million, nine hundred seventy-five thousand, seven hundred twenty-eight".