865782324820 has 192 divisors, whose sum is σ = 2208374784000. Its totient is φ = 278507206656.

The previous prime is 865782324811. The next prime is 865782324859. The reversal of 865782324820 is 28423287568.

865782324820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 222621436 + ... + 222625324.

It is an arithmetic number, because the mean of its divisors is an integer number (11501952000).

Almost surely, 2^865782324820 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 865782324820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104187392000).

865782324820 is an abundant number, since it is smaller than the sum of its proper divisors (1342592459180).

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

865782324820 is a wasteful number, since it uses less digits than its factorization.

865782324820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 865782324820 in words is "eight hundred sixty-five billion, seven hundred eighty-two million, three hundred twenty-four thousand, eight hundred twenty".