6678209 has 2 divisors, whose sum is σ = 6678210. Its totient is φ = 6678208.

The previous prime is 6678197. The next prime is 6678227. The reversal of 6678209 is 9028766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 124609 = 2560^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 6678209 - 2¹⁶ = 6612673 is a prime.

It is not a weakly prime, because it can be changed into another prime (6678289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339104 + 3339105.

It is an arithmetic number, because the mean of its divisors is an integer number (3339105).

Almost surely, 2^6678209 is an apocalyptic number.

It is an amenable number.

6678209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6678209 is an equidigital number, since it uses as much as digits as its factorization.

6678209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 6678209 is about 2584.2230940846. The cubic root of 6678209 is about 188.3157606667.

The spelling of 6678209 in words is "six million, six hundred seventy-eight thousand, two hundred nine".