8609664 has 64 divisors (see below), whose sum is σ = 26144640. Its totient is φ = 2459136.

The previous prime is 8609663. The next prime is 8609669. The reversal of 8609664 is 4669068.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8609663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087 + ... + 4289.

It is an arithmetic number, because the mean of its divisors is an integer number (408510).

Almost surely, 2^8609664 is an apocalyptic number.

8609664 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8609664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13072320).

8609664 is an abundant number, since it is smaller than the sum of its proper divisors (17534976).

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

8609664 is a wasteful number, since it uses less digits than its factorization.

8609664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227 (or 3215 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 8609664 is about 2934.2228954188. Note that the first 3 decimals coincide. The cubic root of 8609664 is about 204.9566753576.

The spelling of 8609664 in words is "eight million, six hundred nine thousand, six hundred sixty-four".