9640664 has 32 divisors (see below), whose sum is σ = 20010240. Its totient is φ = 4317600.

The previous prime is 9640663. The next prime is 9640667. The reversal of 9640664 is 4660469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640661) 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 7 ways as a sum of consecutive naturals, for example, 5477 + ... + 7019.

It is an arithmetic number, because the mean of its divisors is an integer number (625320).

Almost surely, 2^9640664 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 9640664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10005120).

9640664 is an abundant number, since it is smaller than the sum of its proper divisors (10369576).

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

9640664 is a wasteful number, since it uses less digits than its factorization.

9640664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 9640664 is about 3104.9418674107. The cubic root of 9640664 is about 212.8313741029.

The spelling of 9640664 in words is "nine million, six hundred forty thousand, six hundred sixty-four".