6531668 has 48 divisors (see below), whose sum is σ = 14159040. Its totient is φ = 2592000.

The previous prime is 6531653. The next prime is 6531673. The reversal of 6531668 is 8661356.

Its product of digits (25920) is a multiple of the sum of its prime factors (648).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10568 + ... + 11168.

It is an arithmetic number, because the mean of its divisors is an integer number (294980).

Almost surely, 2^6531668 is an apocalyptic number.

It is an amenable number.

6531668 is an abundant number, since it is smaller than the sum of its proper divisors (7627372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6531668 is a wasteful number, since it uses less digits than its factorization.

With its successor (6531669) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (646).

With its successor (6531669) it forms an eRAP, since the sums of their prime factors are consecutive (648 and 649).

6531668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 646 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 6531668 is about 2555.7128164174. The cubic root of 6531668 is about 186.9281468729.

The spelling of 6531668 in words is "six million, five hundred thirty-one thousand, six hundred sixty-eight".