6649779 has 8 divisors (see below), whose sum is σ = 9152512. Its totient is φ = 4290120.

The previous prime is 6649733. The next prime is 6649801. The reversal of 6649779 is 9779466.

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

It is not a de Polignac number, because 6649779 - 2⁹ = 6649267 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 (6649579) 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, 35659 + ... + 35844.

It is an arithmetic number, because the mean of its divisors is an integer number (1144064).

Almost surely, 2^6649779 is an apocalyptic number.

6649779 is a deficient number, since it is larger than the sum of its proper divisors (2502733).

6649779 is a wasteful number, since it uses less digits than its factorization.

6649779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71537.

The product of its digits is 571536, while the sum is 48.

The square root of 6649779 is about 2578.7165412274. The cubic root of 6649779 is about 188.0481523707.

The spelling of 6649779 in words is "six million, six hundred forty-nine thousand, seven hundred seventy-nine".