6640489 has 8 divisors (see below), whose sum is σ = 7181568. Its totient is φ = 6116160.

The previous prime is 6640477. The next prime is 6640493. The reversal of 6640489 is 9840466.

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 6640489 - 2¹⁵ = 6607721 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 (6640409) 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, 3357 + ... + 4954.

It is an arithmetic number, because the mean of its divisors is an integer number (897696).

Almost surely, 2^6640489 is an apocalyptic number.

It is an amenable number.

6640489 is a deficient number, since it is larger than the sum of its proper divisors (541079).

6640489 is a wasteful number, since it uses less digits than its factorization.

6640489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8375.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 6640489 is about 2576.9146279999. The cubic root of 6640489 is about 187.9605413641.

The spelling of 6640489 in words is "six million, six hundred forty thousand, four hundred eighty-nine".