6388664 has 16 divisors (see below), whose sum is σ = 12499920. Its totient is φ = 3055360.

The previous prime is 6388637. The next prime is 6388667. The reversal of 6388664 is 4668836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6388667) 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 3 ways as a sum of consecutive naturals, for example, 17177 + ... + 17544.

It is an arithmetic number, because the mean of its divisors is an integer number (781245).

Almost surely, 2^6388664 is an apocalyptic number.

It is an amenable number.

6388664 is a deficient number, since it is larger than the sum of its proper divisors (6111256).

6388664 is a wasteful number, since it uses less digits than its factorization.

6388664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34750 (or 34746 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 6388664 is about 2527.5806614231. The cubic root of 6388664 is about 185.5538697037.

The spelling of 6388664 in words is "six million, three hundred eighty-eight thousand, six hundred sixty-four".