6643245 has 32 divisors (see below), whose sum is σ = 12257280. Its totient is φ = 3009600.

The previous prime is 6643229. The next prime is 6643249. The reversal of 6643245 is 5423466.

It is not a de Polignac number, because 6643245 - 2⁴ = 6643229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643249) 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 31 ways as a sum of consecutive naturals, for example, 15646 + ... + 16064.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^6643245 is an apocalyptic number.

It is an amenable number.

6643245 is a deficient number, since it is larger than the sum of its proper divisors (5614035).

6643245 is a wasteful number, since it uses less digits than its factorization.

6643245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585.

The product of its digits is 17280, while the sum is 30.

The square root of 6643245 is about 2577.4493205493. The cubic root of 6643245 is about 187.9865408352.

The spelling of 6643245 in words is "six million, six hundred forty-three thousand, two hundred forty-five".