9664 has 14 divisors (see below), whose sum is σ = 19304. Its totient is φ = 4800.

The previous prime is 9661. The next prime is 9677. The reversal of 9664 is 4669.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12 + ... + 139.

2⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

9664 is a deficient number, since it is larger than the sum of its proper divisors (9640).

9664 is a wasteful number, since it uses less digits than its factorization.

9664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 153 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 9664 is about 98.3056458196. The cubic root of 9664 is about 21.3002960865.

The spelling of 9664 in words is "nine thousand, six hundred sixty-four".