6644979 has 12 divisors (see below), whose sum is σ = 10471032. Its totient is φ = 4027200.

The previous prime is 6644969. The next prime is 6644983. The reversal of 6644979 is 9794466.

It is not a de Polignac number, because 6644979 - 2²⁰ = 5596403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6644959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33462 + ... + 33659.

It is an arithmetic number, because the mean of its divisors is an integer number (872586).

Almost surely, 2^6644979 is an apocalyptic number.

6644979 is a deficient number, since it is larger than the sum of its proper divisors (3826053).

6644979 is a wasteful number, since it uses less digits than its factorization.

6644979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67138 (or 67135 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 6644979 is about 2577.7856776699. The cubic root of 6644979 is about 188.0028953078.

The spelling of 6644979 in words is "six million, six hundred forty-four thousand, nine hundred seventy-nine".