6639312 has 20 divisors (see below), whose sum is σ = 17151680. Its totient is φ = 2213088.

The previous prime is 6639307. The next prime is 6639313. The reversal of 6639312 is 2139366.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6639312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639313) 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 3 ways as a sum of consecutive naturals, for example, 69112 + ... + 69207.

It is an arithmetic number, because the mean of its divisors is an integer number (857584).

Almost surely, 2^6639312 is an apocalyptic number.

It is an amenable number.

6639312 is an abundant number, since it is smaller than the sum of its proper divisors (10512368).

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

6639312 is a wasteful number, since it uses less digits than its factorization.

6639312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138330 (or 138324 counting only the distinct ones).

The product of its digits is 5832, while the sum is 30.

The square root of 6639312 is about 2576.6862439963. The cubic root of 6639312 is about 187.9494356243.

The spelling of 6639312 in words is "six million, six hundred thirty-nine thousand, three hundred twelve".