6639936 has 28 divisors (see below), whose sum is σ = 17568672. Its totient is φ = 2213248.

The previous prime is 6639929. The next prime is 6639937. The reversal of 6639936 is 6399366.

It is a d-powerful number, because it can be written as 6 + 6² + 3¹¹ + 9² + 9² + 3¹⁴ + 6⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17100 + ... + 17483.

Almost surely, 2^6639936 is an apocalyptic number.

It is an amenable number.

6639936 is an abundant number, since it is smaller than the sum of its proper divisors (10928736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6639936 is a wasteful number, since it uses less digits than its factorization.

6639936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34598 (or 34588 counting only the distinct ones).

The product of its digits is 157464, while the sum is 42.

The square root of 6639936 is about 2576.8073269067. The cubic root of 6639936 is about 187.9553236227.

The spelling of 6639936 in words is "six million, six hundred thirty-nine thousand, nine hundred thirty-six".