9728664 has 64 divisors (see below), whose sum is σ = 27181440. Its totient is φ = 2876160.

The previous prime is 9728651. The next prime is 9728681. The reversal of 9728664 is 4668279.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10924 + ... + 11780.

It is an arithmetic number, because the mean of its divisors is an integer number (424710).

Almost surely, 2^9728664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9728664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13590720).

9728664 is an abundant number, since it is smaller than the sum of its proper divisors (17452776).

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

9728664 is a wasteful number, since it uses less digits than its factorization.

9728664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 916 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 9728664 is about 3119.0806337766. The cubic root of 9728664 is about 213.4769887464.

The spelling of 9728664 in words is "nine million, seven hundred twenty-eight thousand, six hundred sixty-four".