865800579888 has 100 divisors (see below), whose sum is σ = 2506713508728. Its totient is φ = 288503976960.

The previous prime is 865800579871. The next prime is 865800579949. The reversal of 865800579888 is 888975008568.

It is a happy number.

865800579888 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×865800579888² (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 an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3831295 + ... + 4050977.

Almost surely, 2^865800579888 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 865800579888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253356754364).

865800579888 is an abundant number, since it is smaller than the sum of its proper divisors (1640912928840).

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

865800579888 is a wasteful number, since it uses less digits than its factorization.

865800579888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222744 (or 222729 counting only the distinct ones).

The product of its (nonzero) digits is 309657600, while the sum is 72.

The spelling of 865800579888 in words is "eight hundred sixty-five billion, eight hundred million, five hundred seventy-nine thousand, eight hundred eighty-eight".