9945664 has 28 divisors (see below), whose sum is σ = 20777200. Its totient is φ = 4710528.

The previous prime is 9945647. The next prime is 9945667. The reversal of 9945664 is 4665499.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9945664.

It is not an unprimeable number, because it can be changed into a prime (9945667) 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, 2874 + ... + 5305.

Almost surely, 2^9945664 is an apocalyptic number.

It is an amenable number.

9945664 is an abundant number, since it is smaller than the sum of its proper divisors (10831536).

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

9945664 is a wasteful number, since it uses less digits than its factorization.

9945664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8210 (or 8200 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 9945664 is about 3153.6746820178. The cubic root of 9945664 is about 215.0525489004.

It can be divided in two parts, 9945 and 664, that added together give a square (10609 = 103²).

The spelling of 9945664 in words is "nine million, nine hundred forty-five thousand, six hundred sixty-four".