6644006 has 4 divisors (see below), whose sum is σ = 9966012. Its totient is φ = 3322002.

The previous prime is 6643999. The next prime is 6644023. The reversal of 6644006 is 6004466.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661000 + ... + 1661003.

It is an arithmetic number, because the mean of its divisors is an integer number (2491503).

Almost surely, 2^6644006 is an apocalyptic number.

6644006 is a deficient number, since it is larger than the sum of its proper divisors (3322006).

6644006 is a wasteful number, since it uses less digits than its factorization.

6644006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322005.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 6644006 is about 2577.5969428908. The cubic root of 6644006 is about 187.9937186675.

The spelling of 6644006 in words is "six million, six hundred forty-four thousand, six".