6684745 has 4 divisors (see below), whose sum is σ = 8021700. Its totient is φ = 5347792.

The previous prime is 6684719. The next prime is 6684749. The reversal of 6684745 is 5474866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5474866 = 2 ⋅2737433.

It can be written as a sum of positive squares in 2 ways, for example, as 3767481 + 2917264 = 1941^2 + 1708^2 .

It is a cyclic number.

It is not a de Polignac number, because 6684745 - 2⁹ = 6684233 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6684698 and 6684707.

It is not an unprimeable number, because it can be changed into a prime (6684749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668470 + ... + 668479.

It is an arithmetic number, because the mean of its divisors is an integer number (2005425).

Almost surely, 2^6684745 is an apocalyptic number.

It is an amenable number.

6684745 is a deficient number, since it is larger than the sum of its proper divisors (1336955).

6684745 is a wasteful number, since it uses less digits than its factorization.

6684745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336954.

The product of its digits is 161280, while the sum is 40.

The square root of 6684745 is about 2585.4873815202. The cubic root of 6684745 is about 188.3771758600.

The spelling of 6684745 in words is "six million, six hundred eighty-four thousand, seven hundred forty-five".