865324320 has 144 divisors (see below), whose sum is σ = 3170881728. Its totient is φ = 197783040.

The previous prime is 865324319. The next prime is 865324337. The reversal of 865324320 is 23423568.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5125 + ... + 41915.

It is an arithmetic number, because the mean of its divisors is an integer number (22020012).

Almost surely, 2^865324320 is an apocalyptic number.

865324320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865324320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1585440864).

865324320 is an abundant number, since it is smaller than the sum of its proper divisors (2305557408).

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

865324320 is a wasteful number, since it uses less digits than its factorization.

865324320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36823 (or 36808 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 865324320 is about 29416.3954284001. The cubic root of 865324320 is about 952.9270093736.

Adding to 865324320 its reverse (23423568), we get a palindrome (888747888).

The spelling of 865324320 in words is "eight hundred sixty-five million, three hundred twenty-four thousand, three hundred twenty".