6639667 has 8 divisors (see below), whose sum is σ = 6829920. Its totient is φ = 6452160.

The previous prime is 6639653. The next prime is 6639679. The reversal of 6639667 is 7669366.

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 6639667 - 2¹⁹ = 6115379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6639697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4818 + ... + 6040.

It is an arithmetic number, because the mean of its divisors is an integer number (853740).

Almost surely, 2^6639667 is an apocalyptic number.

6639667 is a deficient number, since it is larger than the sum of its proper divisors (190253).

6639667 is a wasteful number, since it uses less digits than its factorization.

6639667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373.

The product of its digits is 244944, while the sum is 43.

The square root of 6639667 is about 2576.7551300036. The cubic root of 6639667 is about 187.9527854122.

The spelling of 6639667 in words is "six million, six hundred thirty-nine thousand, six hundred sixty-seven".