6644659 has 8 divisors (see below), whose sum is σ = 7637760. Its totient is φ = 5662536.

The previous prime is 6644647. The next prime is 6644681. The reversal of 6644659 is 9564466.

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 6644659 - 2⁹ = 6644147 is a prime.

It is a Duffinian number.

6644659 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6644159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1399 + ... + 3904.

It is an arithmetic number, because the mean of its divisors is an integer number (954720).

Almost surely, 2^6644659 is an apocalyptic number.

6644659 is a deficient number, since it is larger than the sum of its proper divisors (993101).

6644659 is a wasteful number, since it uses less digits than its factorization.

6644659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5489.

The product of its digits is 155520, while the sum is 40.

The square root of 6644659 is about 2577.7236081473. The cubic root of 6644659 is about 187.9998773954. Note that the first 3 decimals are identical.

The spelling of 6644659 in words is "six million, six hundred forty-four thousand, six hundred fifty-nine".