8547991687872 has 448 divisors, whose sum is σ = 30937814476800. Its totient is φ = 2253746073600.

The previous prime is 8547991687843. The next prime is 8547991687913. The reversal of 8547991687872 is 2787861997458.

8547991687872 is a `hidden beast` number, since 8 + 5 + 479 + 9 + 1 + 6 + 8 + 78 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a junction number, because it is equal to n+sod(n) for n = 8547991687791 and 8547991687800.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 753054997 + ... + 753066347.

It is an arithmetic number, because the mean of its divisors is an integer number (69057621600).

Almost surely, 2^{8547991687872} 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 8547991687872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15468907238400).

8547991687872 is an abundant number, since it is smaller than the sum of its proper divisors (22389822788928).

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

8547991687872 is a wasteful number, since it uses less digits than its factorization.

8547991687872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16181 (or 16165 counting only the distinct ones).

The product of its digits is 3413975040, while the sum is 81.

The spelling of 8547991687872 in words is "eight trillion, five hundred forty-seven billion, nine hundred ninety-one million, six hundred eighty-seven thousand, eight hundred seventy-two".