5661664 has 12 divisors (see below), whose sum is σ = 11146464. Its totient is φ = 2830816.

The previous prime is 5661659. The next prime is 5661673. The reversal of 5661664 is 4661665.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 88432 + ... + 88495.

It is an arithmetic number, because the mean of its divisors is an integer number (928872).

Almost surely, 2^5661664 is an apocalyptic number.

It is an amenable number.

5661664 is a deficient number, since it is larger than the sum of its proper divisors (5484800).

5661664 is a wasteful number, since it uses less digits than its factorization.

5661664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176937 (or 176929 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 5661664 is about 2379.4251406590. The cubic root of 5661664 is about 178.2302285384.

Subtracting from 5661664 its reverse (4661665), we obtain a palindrome (999999).

The spelling of 5661664 in words is "five million, six hundred sixty-one thousand, six hundred sixty-four".