6642887 has 2 divisors, whose sum is σ = 6642888. Its totient is φ = 6642886.

The previous prime is 6642877. The next prime is 6642893. The reversal of 6642887 is 7882466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6642887 - 2¹² = 6638791 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 (6642817) 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 as a sum of consecutive naturals, namely, 3321443 + 3321444.

It is an arithmetic number, because the mean of its divisors is an integer number (3321444).

Almost surely, 2^6642887 is an apocalyptic number.

6642887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642887 is an equidigital number, since it uses as much as digits as its factorization.

6642887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 41.

The square root of 6642887 is about 2577.3798711094. The cubic root of 6642887 is about 187.9831639518.

The spelling of 6642887 in words is "six million, six hundred forty-two thousand, eight hundred eighty-seven".