6639767 has 8 divisors (see below), whose sum is σ = 6806256. Its totient is φ = 6475392.

The previous prime is 6639757. The next prime is 6639769. The reversal of 6639767 is 7679366.

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 6639767 - 2⁸ = 6639511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639769) 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, 7133 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (850782).

Almost surely, 2^6639767 is an apocalyptic number.

6639767 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6639767 is a deficient number, since it is larger than the sum of its proper divisors (166489).

6639767 is a wasteful number, since it uses less digits than its factorization.

6639767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057.

The product of its digits is 285768, while the sum is 44.

The square root of 6639767 is about 2576.7745341803. The cubic root of 6639767 is about 187.9537289929.

The spelling of 6639767 in words is "six million, six hundred thirty-nine thousand, seven hundred sixty-seven".