6649644 has 12 divisors (see below), whose sum is σ = 15515864. Its totient is φ = 2216544.

The previous prime is 6649633. The next prime is 6649661. The reversal of 6649644 is 4469466.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277057 + ... + 277080.

Almost surely, 2^6649644 is an apocalyptic number.

It is an amenable number.

6649644 is an abundant number, since it is smaller than the sum of its proper divisors (8866220).

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

6649644 is a wasteful number, since it uses less digits than its factorization.

6649644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554144 (or 554142 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 6649644 is about 2578.6903652823. The cubic root of 6649644 is about 188.0468798135.

The spelling of 6649644 in words is "six million, six hundred forty-nine thousand, six hundred forty-four".