6644685 has 8 divisors (see below), whose sum is σ = 10631520. Its totient is φ = 3543824.

The previous prime is 6644681. The next prime is 6644717. The reversal of 6644685 is 5864466.

6644685 is nontrivially palindromic in base 11.

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 6644685 - 2² = 6644681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644681) 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, 221475 + ... + 221504.

It is an arithmetic number, because the mean of its divisors is an integer number (1328940).

Almost surely, 2^6644685 is an apocalyptic number.

It is an amenable number.

6644685 is a deficient number, since it is larger than the sum of its proper divisors (3986835).

6644685 is a wasteful number, since it uses less digits than its factorization.

6644685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442987.

The product of its digits is 138240, while the sum is 39.

The square root of 6644685 is about 2577.7286513518. The cubic root of 6644685 is about 188.0001226044. Note that the first 3 decimals are identical.

The spelling of 6644685 in words is "six million, six hundred forty-four thousand, six hundred eighty-five".