9815664 has 80 divisors (see below), whose sum is σ = 28069632. Its totient is φ = 2939904.

The previous prime is 9815657. The next prime is 9815669. The reversal of 9815664 is 4665189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9815669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18507 + ... + 19029.

Almost surely, 2^9815664 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 9815664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14034816).

9815664 is an abundant number, since it is smaller than the sum of its proper divisors (18253968).

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

9815664 is a wasteful number, since it uses less digits than its factorization.

9815664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 568 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 9815664 is about 3132.9960102113. The cubic root of 9815664 is about 214.1114509574. Note that the first 3 decimals are identical.

The spelling of 9815664 in words is "nine million, eight hundred fifteen thousand, six hundred sixty-four".