6649879 has 4 divisors (see below), whose sum is σ = 6662584. Its totient is φ = 6637176.

The previous prime is 6649871. The next prime is 6649883. The reversal of 6649879 is 9789466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6649879 - 2³ = 6649871 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 (6649871) 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, 5532 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (1665646).

Almost surely, 2^6649879 is an apocalyptic number.

6649879 is a deficient number, since it is larger than the sum of its proper divisors (12705).

6649879 is a wasteful number, since it uses less digits than its factorization.

6649879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12704.

The product of its digits is 653184, while the sum is 49.

The square root of 6649879 is about 2578.7359306451. The cubic root of 6649879 is about 188.0490949945.

The spelling of 6649879 in words is "six million, six hundred forty-nine thousand, eight hundred seventy-nine".