865816848 has 120 divisors (see below), whose sum is σ = 2633211672. Its totient is φ = 263983104.

The previous prime is 865816829. The next prime is 865816873. The reversal of 865816848 is 848618568.

It can be written as a sum of positive squares in 4 ways, for example, as 25280784 + 840536064 = 5028^2 + 28992^2 .

It is a junction number, because it is equal to n+sod(n) for n = 865816794 and 865816803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209490 + ... + 213582.

Almost surely, 2^865816848 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 865816848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316605836).

865816848 is an abundant number, since it is smaller than the sum of its proper divisors (1767394824).

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

865816848 is a wasteful number, since it uses less digits than its factorization.

865816848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233 (or 4224 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 865816848 is about 29424.7658954154. The cubic root of 865816848 is about 953.1077717398.

The spelling of 865816848 in words is "eight hundred sixty-five million, eight hundred sixteen thousand, eight hundred forty-eight".