6644671 has 8 divisors (see below), whose sum is σ = 7675344. Its totient is φ = 5685120.

The previous prime is 6644647. The next prime is 6644681. The reversal of 6644671 is 1764466.

It is a happy number.

It is a Cunningham number, because it is equal to 188³-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6644671 - 2⁷ = 6644543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17580 + ... + 17953.

It is an arithmetic number, because the mean of its divisors is an integer number (959418).

Almost surely, 2^6644671 is an apocalyptic number.

6644671 is a deficient number, since it is larger than the sum of its proper divisors (1030673).

6644671 is a wasteful number, since it uses less digits than its factorization.

6644671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35561.

The product of its digits is 24192, while the sum is 34.

The square root of 6644671 is about 2577.7259357814. The cubic root of 6644671 is about 187.9999905689. Note that the first 5 decimals are identical.

It can be divided in two parts, 664 and 4671, that added together give a palindrome (5335).

The spelling of 6644671 in words is "six million, six hundred forty-four thousand, six hundred seventy-one".