9905728 has 28 divisors (see below), whose sum is σ = 22465792. Its totient is φ = 4245120.

The previous prime is 9905719. The next prime is 9905759. The reversal of 9905728 is 8275099.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10608 + ... + 11503.

Almost surely, 2^9905728 is an apocalyptic number.

It is an amenable number.

9905728 is an abundant number, since it is smaller than the sum of its proper divisors (12560064).

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

9905728 is a wasteful number, since it uses less digits than its factorization.

9905728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130 (or 22120 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 9905728 is about 3147.3366518376. The cubic root of 9905728 is about 214.7643207988.

The spelling of 9905728 in words is "nine million, nine hundred five thousand, seven hundred twenty-eight".