9921768 has 32 divisors (see below), whose sum is σ = 25123200. Its totient is φ = 3264768.

The previous prime is 9921733. The next prime is 9921797. The reversal of 9921768 is 8671299.

9921768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721 + ... + 4512.

It is an arithmetic number, because the mean of its divisors is an integer number (785100).

Almost surely, 2^9921768 is an apocalyptic number.

It is an amenable number.

9921768 is an abundant number, since it is smaller than the sum of its proper divisors (15201432).

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

9921768 is a wasteful number, since it uses less digits than its factorization.

9921768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321 (or 5317 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 9921768 is about 3149.8838073808. The cubic root of 9921768 is about 214.8801784122.

The spelling of 9921768 in words is "nine million, nine hundred twenty-one thousand, seven hundred sixty-eight".