9816640 has 28 divisors (see below), whose sum is σ = 23376636. Its totient is φ = 3926528.

The previous prime is 9816637. The next prime is 9816641. The reversal of 9816640 is 466189.

9816640 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 2 ways, for example, as 5456896 + 4359744 = 2336^2 + 2088^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9816596 and 9816605.

It is not an unprimeable number, because it can be changed into a prime (9816641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15019 + ... + 15658.

Almost surely, 2^9816640 is an apocalyptic number.

It is an amenable number.

9816640 is an abundant number, since it is smaller than the sum of its proper divisors (13559996).

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

9816640 is a wasteful number, since it uses less digits than its factorization.

9816640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30694 (or 30684 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 9816640 is about 3133.1517677891. The cubic root of 9816640 is about 214.1185472968.

The spelling of 9816640 in words is "nine million, eight hundred sixteen thousand, six hundred forty".