6647887 has 2 divisors, whose sum is σ = 6647888. Its totient is φ = 6647886.

The previous prime is 6647869. The next prime is 6647899. The reversal of 6647887 is 7887466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6647887 is a 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 (6647287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323943 + 3323944.

It is an arithmetic number, because the mean of its divisors is an integer number (3323944).

Almost surely, 2^6647887 is an apocalyptic number.

6647887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647887 is an equidigital number, since it uses as much as digits as its factorization.

6647887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 46.

The square root of 6647887 is about 2578.3496659685. The cubic root of 6647887 is about 188.0303161462.

The spelling of 6647887 in words is "six million, six hundred forty-seven thousand, eight hundred eighty-seven".