6631887678 has 128 divisors (see below), whose sum is σ = 15498362880. Its totient is φ = 1876331520.

The previous prime is 6631887667. The next prime is 6631887727. The reversal of 6631887678 is 8767881366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3987075 + ... + 3988737.

It is an arithmetic number, because the mean of its divisors is an integer number (121080960).

Almost surely, 2^6631887678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6631887678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7749181440).

6631887678 is an abundant number, since it is smaller than the sum of its proper divisors (8866475202).

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

6631887678 is a wasteful number, since it uses less digits than its factorization.

6631887678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794.

The product of its digits is 16257024, while the sum is 60.

The square root of 6631887678 is about 81436.4026587619. The cubic root of 6631887678 is about 1878.7935217887.

The spelling of 6631887678 in words is "six billion, six hundred thirty-one million, eight hundred eighty-seven thousand, six hundred seventy-eight".