9721616 has 40 divisors (see below), whose sum is σ = 20073120. Its totient is φ = 4548096.

The previous prime is 9721609. The next prime is 9721643. The reversal of 9721616 is 6161279.

It is a happy number.

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, 34211 + ... + 34493.

It is an arithmetic number, because the mean of its divisors is an integer number (501828).

Almost surely, 2^9721616 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 9721616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10036560).

9721616 is an abundant number, since it is smaller than the sum of its proper divisors (10351504).

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

9721616 is a wasteful number, since it uses less digits than its factorization.

9721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 417 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 9721616 is about 3117.9506089738. The cubic root of 9721616 is about 213.4254246502.

The spelling of 9721616 in words is "nine million, seven hundred twenty-one thousand, six hundred sixteen".