6639368 has 12 divisors (see below), whose sum is σ = 12462495. Its totient is φ = 3316040.

The previous prime is 6639349. The next prime is 6639377. The reversal of 6639368 is 8639366.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 3319684 + 3319684 = 1822^2 + 1822^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1822.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6833 + ... + 7743.

Almost surely, 2^6639368 is an apocalyptic number.

It is an amenable number.

6639368 is a deficient number, since it is larger than the sum of its proper divisors (5823127).

6639368 is an frugal number, since it uses more digits than its factorization.

6639368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828 (or 913 counting only the distinct ones).

The product of its digits is 139968, while the sum is 41.

The square root of 6639368 is about 2576.6971106438. The cubic root of 6639368 is about 187.9499640495.

It can be divided in two parts, 6639 and 368, that added together give a palindrome (7007).

The spelling of 6639368 in words is "six million, six hundred thirty-nine thousand, three hundred sixty-eight".