864818535888 has 240 divisors, whose sum is σ = 2527233246720. Its totient is φ = 286292662272.

The previous prime is 864818535887. The next prime is 864818535899. The reversal of 864818535888 is 888535818468.

It is a happy number.

864818535888 is a `hidden beast` number, since 8 + 6 + 4 + 8 + 1 + 8 + 535 + 8 + 88 = 666.

It is a super-2 number, since 2×864818535888² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864818535887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 433927020 + ... + 433929012.

It is an arithmetic number, because the mean of its divisors is an integer number (10530138528).

Almost surely, 2^864818535888 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 864818535888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263616623360).

864818535888 is an abundant number, since it is smaller than the sum of its proper divisors (1662414710832).

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

864818535888 is a wasteful number, since it uses less digits than its factorization.

864818535888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728 (or 2710 counting only the distinct ones).

The product of its digits is 471859200, while the sum is 72.

The spelling of 864818535888 in words is "eight hundred sixty-four billion, eight hundred eighteen million, five hundred thirty-five thousand, eight hundred eighty-eight".