6678321 has 16 divisors (see below), whose sum is σ = 9683520. Its totient is φ = 4069440.

The previous prime is 6678317. The next prime is 6678383. The reversal of 6678321 is 1238766.

6678321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6678321 - 2² = 6678317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6678421) 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 15 ways as a sum of consecutive naturals, for example, 3466 + ... + 5036.

It is an arithmetic number, because the mean of its divisors is an integer number (605220).

Almost surely, 2^6678321 is an apocalyptic number.

It is an amenable number.

6678321 is a deficient number, since it is larger than the sum of its proper divisors (3005199).

6678321 is a wasteful number, since it uses less digits than its factorization.

6678321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its digits is 12096, while the sum is 33.

The square root of 6678321 is about 2584.2447639494. The cubic root of 6678321 is about 188.3168134064.

It can be divided in two parts, 66 and 78321, that added together give a palindrome (78387).

The spelling of 6678321 in words is "six million, six hundred seventy-eight thousand, three hundred twenty-one".