6646887 has 32 divisors (see below), whose sum is σ = 10987200. Its totient is φ = 3943296.

The previous prime is 6646883. The next prime is 6646891. The reversal of 6646887 is 7886466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6646883) and next prime (6646891).

It is not a de Polignac number, because 6646887 - 2² = 6646883 is a prime.

It is a super-2 number, since 2×6646887² = 88362213581538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646883) 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 31 ways as a sum of consecutive naturals, for example, 9853 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (343350).

Almost surely, 2^6646887 is an apocalyptic number.

6646887 is a deficient number, since it is larger than the sum of its proper divisors (4340313).

6646887 is a wasteful number, since it uses less digits than its factorization.

6646887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 698 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 6646887 is about 2578.1557361804. The cubic root of 6646887 is about 188.0208875992.

The spelling of 6646887 in words is "six million, six hundred forty-six thousand, eight hundred eighty-seven".