6639800 has 24 divisors (see below), whose sum is σ = 15438000. Its totient is φ = 2655840.

The previous prime is 6639799. The next prime is 6639803. The reversal of 6639800 is 89366.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16400 + ... + 16799.

It is an arithmetic number, because the mean of its divisors is an integer number (643250).

Almost surely, 2^6639800 is an apocalyptic number.

It is an amenable number.

6639800 is an abundant number, since it is smaller than the sum of its proper divisors (8798200).

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

6639800 is a wasteful number, since it uses less digits than its factorization.

6639800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33215 (or 33206 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6639800 is about 2576.7809375265. The cubic root of 6639800 is about 187.9540403724.

The spelling of 6639800 in words is "six million, six hundred thirty-nine thousand, eight hundred".