6639707 has 8 divisors (see below), whose sum is σ = 7130592. Its totient is φ = 6160000.

The previous prime is 6639697. The next prime is 6639719. The reversal of 6639707 is 7079366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6639707 - 2¹² = 6635611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6639757) 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 7 ways as a sum of consecutive naturals, for example, 1544 + ... + 3957.

It is an arithmetic number, because the mean of its divisors is an integer number (891324).

Almost surely, 2^6639707 is an apocalyptic number.

6639707 is a deficient number, since it is larger than the sum of its proper divisors (490885).

6639707 is a wasteful number, since it uses less digits than its factorization.

6639707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 6639707 is about 2576.7628916918. The cubic root of 6639707 is about 187.9531628456.

The spelling of 6639707 in words is "six million, six hundred thirty-nine thousand, seven hundred seven".