6444666 has 24 divisors (see below), whose sum is σ = 14785524. Its totient is φ = 2021760.

The previous prime is 6444653. The next prime is 6444671. The reversal of 6444666 is 6664446.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4968441 + 1476225 = 2229^2 + 1215^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6444666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10225 + ... + 10836.

Almost surely, 2^6444666 is an apocalyptic number.

6444666 is an abundant number, since it is smaller than the sum of its proper divisors (8340858).

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

6444666 is a wasteful number, since it uses less digits than its factorization.

6444666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21086 (or 21083 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 6444666 is about 2538.6346724174. The cubic root of 6444666 is about 186.0944716063.

The spelling of 6444666 in words is "six million, four hundred forty-four thousand, six hundred sixty-six".