6644564 has 6 divisors (see below), whose sum is σ = 11627994. Its totient is φ = 3322280.

The previous prime is 6644551. The next prime is 6644579. The reversal of 6644564 is 4654466.

It can be written as a sum of positive squares in only one way, i.e., 3610000 + 3034564 = 1900^2 + 1742^2 .

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, 830567 + ... + 830574.

It is an arithmetic number, because the mean of its divisors is an integer number (1937999).

Almost surely, 2^6644564 is an apocalyptic number.

It is an amenable number.

6644564 is a deficient number, since it is larger than the sum of its proper divisors (4983430).

6644564 is a wasteful number, since it uses less digits than its factorization.

6644564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661145 (or 1661143 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 6644564 is about 2577.7051809701. The cubic root of 6644564 is about 187.9989814340.

The spelling of 6644564 in words is "six million, six hundred forty-four thousand, five hundred sixty-four".