6640330 has 16 divisors (see below), whose sum is σ = 12472704. Its totient is φ = 2540560.

The previous prime is 6640327. The next prime is 6640331. The reversal of 6640330 is 330466.

It is not an unprimeable number, because it can be changed into a prime (6640331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14206 + ... + 14665.

It is an arithmetic number, because the mean of its divisors is an integer number (779544).

Almost surely, 2^6640330 is an apocalyptic number.

6640330 is a deficient number, since it is larger than the sum of its proper divisors (5832374).

6640330 is a wasteful number, since it uses less digits than its factorization.

6640330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28901.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 6640330 is about 2576.8837769678. The cubic root of 6640330 is about 187.9590411752.

Adding to 6640330 its reverse (330466), we get a palindrome (6970796).

The spelling of 6640330 in words is "six million, six hundred forty thousand, three hundred thirty".