6647279 has 2 divisors, whose sum is σ = 6647280. Its totient is φ = 6647278.

The previous prime is 6647273. The next prime is 6647287. The reversal of 6647279 is 9727466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6647279 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323639 + 3323640.

It is an arithmetic number, because the mean of its divisors is an integer number (3323640).

Almost surely, 2^6647279 is an apocalyptic number.

6647279 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647279 is an equidigital number, since it uses as much as digits as its factorization.

6647279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 6647279 is about 2578.2317583957. The cubic root of 6647279 is about 188.0245837023.

The spelling of 6647279 in words is "six million, six hundred forty-seven thousand, two hundred seventy-nine".