6649679 has 4 divisors (see below), whose sum is σ = 6655776. Its totient is φ = 6643584.

The previous prime is 6649661. The next prime is 6649681. The reversal of 6649679 is 9769466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6649679 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 (6649609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914 + ... + 3759.

It is an arithmetic number, because the mean of its divisors is an integer number (1663944).

Almost surely, 2^6649679 is an apocalyptic number.

6649679 is a deficient number, since it is larger than the sum of its proper divisors (6097).

6649679 is a wasteful number, since it uses less digits than its factorization.

6649679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6096.

The product of its digits is 489888, while the sum is 47.

The square root of 6649679 is about 2578.6971516640. The cubic root of 6649679 is about 188.0472097374.

The spelling of 6649679 in words is "six million, six hundred forty-nine thousand, six hundred seventy-nine".