9781616 has 80 divisors (see below), whose sum is σ = 22165248. Its totient is φ = 4147200.

The previous prime is 9781609. The next prime is 9781631. The reversal of 9781616 is 6161879.

It is a self number, because there is not a number n which added to its sum of digits gives 9781616.

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, 238556 + ... + 238596.

Almost surely, 2^9781616 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 9781616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11082624).

9781616 is an abundant number, since it is smaller than the sum of its proper divisors (12383632).

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

9781616 is a wasteful number, since it uses less digits than its factorization.

9781616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 124 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 9781616 is about 3127.5575134600. The cubic root of 9781616 is about 213.8635984065.

The spelling of 9781616 in words is "nine million, seven hundred eighty-one thousand, six hundred sixteen".