6604640244 has 18 divisors (see below), whose sum is σ = 16695062930. Its totient is φ = 2201546736.

The previous prime is 6604640221. The next prime is 6604640281. The reversal of 6604640244 is 4420464066.

It is a happy number.

6604640244 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 640 + 2 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3815532900 + 2789107344 = 61770^2 + 52812^2 .

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

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: 183462229 = 6604640244 / (6 + 6 + 0 + 4 + 6 + 4 + 0 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 6604640199 and 6604640208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91731079 + ... + 91731150.

Almost surely, 2^6604640244 is an apocalyptic number.

It is an amenable number.

6604640244 is an abundant number, since it is smaller than the sum of its proper divisors (10090422686).

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

6604640244 is a wasteful number, since it uses less digits than its factorization.

6604640244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183462239 (or 183462234 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 6604640244 is about 81268.9377560701. The cubic root of 6604640244 is about 1876.2169516311.

The spelling of 6604640244 in words is "six billion, six hundred four million, six hundred forty thousand, two hundred forty-four".