5561664 has 56 divisors (see below), whose sum is σ = 14935200. Its totient is φ = 1826304.

The previous prime is 5561659. The next prime is 5561687. The reversal of 5561664 is 4661655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15762 + ... + 16110.

It is an arithmetic number, because the mean of its divisors is an integer number (266700).

Almost surely, 2^5561664 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 5561664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7467600).

5561664 is an abundant number, since it is smaller than the sum of its proper divisors (9373536).

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

5561664 is a wasteful number, since it uses less digits than its factorization.

5561664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 437 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 5561664 is about 2358.3180447090. The cubic root of 5561664 is about 177.1746496626.

Subtracting from 5561664 its reverse (4661655), we obtain a palindrome (900009).

The spelling of 5561664 in words is "five million, five hundred sixty-one thousand, six hundred sixty-four".