6639204 has 96 divisors (see below), whose sum is σ = 18797184. Its totient is φ = 1797120.

The previous prime is 6639119. The next prime is 6639209. The reversal of 6639204 is 4029366.

It is not an unprimeable number, because it can be changed into a prime (6639209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90912 + ... + 90984.

It is an arithmetic number, because the mean of its divisors is an integer number (195804).

Almost surely, 2^6639204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9398592).

6639204 is an abundant number, since it is smaller than the sum of its proper divisors (12157980).

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

6639204 is a wasteful number, since it uses less digits than its factorization.

6639204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6639204 is about 2576.6652867612. The cubic root of 6639204 is about 187.9484165102.

The spelling of 6639204 in words is "six million, six hundred thirty-nine thousand, two hundred four".