6639020 has 24 divisors (see below), whose sum is σ = 14049504. Its totient is φ = 2635136.

The previous prime is 6639013. The next prime is 6639041. The reversal of 6639020 is 209366.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1529 + ... + 3951.

It is an arithmetic number, because the mean of its divisors is an integer number (585396).

Almost surely, 2^6639020 is an apocalyptic number.

It is an amenable number.

6639020 is an abundant number, since it is smaller than the sum of its proper divisors (7410484).

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

6639020 is a wasteful number, since it uses less digits than its factorization.

6639020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6639020 is about 2576.6295814494. The cubic root of 6639020 is about 187.9466802163.

The spelling of 6639020 in words is "six million, six hundred thirty-nine thousand, twenty".