5665664 has 16 divisors (see below), whose sum is σ = 11287320. Its totient is φ = 2832768.

The previous prime is 5665661. The next prime is 5665687. The reversal of 5665664 is 4665665.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22004 + ... + 22259.

Almost surely, 2^5665664 is an apocalyptic number.

It is an amenable number.

5665664 is a deficient number, since it is larger than the sum of its proper divisors (5621656).

5665664 is an equidigital number, since it uses as much as digits as its factorization.

5665664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44277 (or 44265 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 5665664 is about 2380.2655314061. The cubic root of 5665664 is about 178.2721922370.

Subtracting from 5665664 its reverse (4665665), we obtain a palindrome (999999).

The spelling of 5665664 in words is "five million, six hundred sixty-five thousand, six hundred sixty-four".