6631668 has 36 divisors (see below), whose sum is σ = 17176068. Its totient is φ = 2156160.

The previous prime is 6631663. The next prime is 6631679. The reversal of 6631668 is 8661366.

It can be written as a sum of positive squares in 2 ways, for example, as 3849444 + 2782224 = 1962^2 + 1668^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631661) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 771 + ... + 3722.

It is an arithmetic number, because the mean of its divisors is an integer number (477113).

Almost surely, 2^6631668 is an apocalyptic number.

It is an amenable number.

6631668 is an abundant number, since it is smaller than the sum of its proper divisors (10544400).

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

6631668 is a wasteful number, since it uses less digits than its factorization.

6631668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544 (or 4539 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 6631668 is about 2575.2025163082. The cubic root of 6631668 is about 187.8772776858.

The spelling of 6631668 in words is "six million, six hundred thirty-one thousand, six hundred sixty-eight".