6644556 has 18 divisors (see below), whose sum is σ = 16796052. Its totient is φ = 2214840.

The previous prime is 6644551. The next prime is 6644579. The reversal of 6644556 is 6554466.

It is a happy number.

6644556 is a `hidden beast` number, since 6 + 644 + 5 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 184571 = 6644556 / (6 + 6 + 4 + 4 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 6644556.

It is not an unprimeable number, because it can be changed into a prime (6644551) 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 in 5 ways as a sum of consecutive naturals, for example, 92250 + ... + 92321.

It is an arithmetic number, because the mean of its divisors is an integer number (933114).

Almost surely, 2^6644556 is an apocalyptic number.

It is an amenable number.

6644556 is an abundant number, since it is smaller than the sum of its proper divisors (10151496).

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

6644556 is a wasteful number, since it uses less digits than its factorization.

6644556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184581 (or 184576 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 6644556 is about 2577.7036292018. The cubic root of 6644556 is about 187.9989059843.

The spelling of 6644556 in words is "six million, six hundred forty-four thousand, five hundred fifty-six".