8631641880 has 192 divisors, whose sum is σ = 30803703840. Its totient is φ = 2166331392.

The previous prime is 8631641807. The next prime is 8631641929. The reversal of 8631641880 is 881461368.

It is a happy number.

8631641880 is a `hidden beast` number, since 8 + 631 + 6 + 4 + 1 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139122 + ... + 191358.

Almost surely, 2^8631641880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8631641880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15401851920).

8631641880 is an abundant number, since it is smaller than the sum of its proper divisors (22172061960).

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

8631641880 is a wasteful number, since it uses less digits than its factorization.

8631641880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52280 (or 52264 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 8631641880 is about 92906.6299033605. The cubic root of 8631641880 is about 2051.3092473420.

The spelling of 8631641880 in words is "eight billion, six hundred thirty-one million, six hundred forty-one thousand, eight hundred eighty".