8819287865856 has 640 divisors, whose sum is σ = 30145220582400. Its totient is φ = 2521603768320.

The previous prime is 8819287865851. The next prime is 8819287865863. The reversal of 8819287865856 is 6585687829188.

8819287865856 is a `hidden beast` number, since 8 + 8 + 1 + 9 + 28 + 7 + 8 + 6 + 585 + 6 = 666.

It is a super-2 number, since 2×8819287865856² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8819287865851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 241334946 + ... + 241371486.

It is an arithmetic number, because the mean of its divisors is an integer number (47101907160).

Almost surely, 2^{8819287865856} 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 8819287865856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15072610291200).

8819287865856 is an abundant number, since it is smaller than the sum of its proper divisors (21325932716544).

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

8819287865856 is a wasteful number, since it uses less digits than its factorization.

8819287865856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36677 (or 36655 counting only the distinct ones).

The product of its digits is 3715891200, while the sum is 81.

The spelling of 8819287865856 in words is "eight trillion, eight hundred nineteen billion, two hundred eighty-seven million, eight hundred sixty-five thousand, eight hundred fifty-six".