6640673 has 8 divisors (see below), whose sum is σ = 7190568. Its totient is φ = 6096384.

The previous prime is 6640663. The next prime is 6640679. The reversal of 6640673 is 3760466.

It can be written as a sum of positive squares in 4 ways, for example, as 1940449 + 4700224 = 1393^2 + 2168^2 .

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 6640673 - 2⁴ = 6640657 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (6640679) 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, 1265 + ... + 3857.

It is an arithmetic number, because the mean of its divisors is an integer number (898821).

Almost surely, 2^6640673 is an apocalyptic number.

It is an amenable number.

6640673 is a deficient number, since it is larger than the sum of its proper divisors (549895).

6640673 is a wasteful number, since it uses less digits than its factorization.

6640673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 6640673 is about 2576.9503293622. The cubic root of 6640673 is about 187.9622774020.

The spelling of 6640673 in words is "six million, six hundred forty thousand, six hundred seventy-three".