6644425 has 12 divisors (see below), whose sum is σ = 8376076. Its totient is φ = 5227200.

The previous prime is 6644413. The next prime is 6644431. The reversal of 6644425 is 5244466.

It can be written as a sum of positive squares in 6 ways, for example, as 29241 + 6615184 = 171^2 + 2572^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6644425 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian 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 in 11 ways as a sum of consecutive naturals, for example, 654 + ... + 3703.

Almost surely, 2^6644425 is an apocalyptic number.

It is an amenable number.

6644425 is a deficient number, since it is larger than the sum of its proper divisors (1731651).

6644425 is a wasteful number, since it uses less digits than its factorization.

6644425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428 (or 4423 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 6644425 is about 2577.6782188629. The cubic root of 6644425 is about 187.9976704857.

The spelling of 6644425 in words is "six million, six hundred forty-four thousand, four hundred twenty-five".