6644644 has 6 divisors (see below), whose sum is σ = 11628134. Its totient is φ = 3322320.

The previous prime is 6644621. The next prime is 6644647. The reversal of 6644644 is 4464466.

It can be written as a sum of positive squares in only one way, i.e., 4571044 + 2073600 = 2138^2 + 1440^2 .

It is not an unprimeable number, because it can be changed into a prime (6644647) by changing a digit.

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, 830577 + ... + 830584.

Almost surely, 2^6644644 is an apocalyptic number.

It is an amenable number.

6644644 is a deficient number, since it is larger than the sum of its proper divisors (4983490).

6644644 is a wasteful number, since it uses less digits than its factorization.

6644644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661165 (or 1661163 counting only the distinct ones).

The product of its digits is 55296, while the sum is 34.

The square root of 6644644 is about 2577.7206986018. The cubic root of 6644644 is about 187.9997359284. Note that the first 3 decimals are identical.

The spelling of 6644644 in words is "six million, six hundred forty-four thousand, six hundred forty-four".