865321760 has 96 divisors (see below), whose sum is σ = 2192520960. Its totient is φ = 321564672.

The previous prime is 865321759. The next prime is 865321763. The reversal of 865321760 is 67123568.

It is not an unprimeable number, because it can be changed into a prime (865321763) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 212867 + ... + 216893.

It is an arithmetic number, because the mean of its divisors is an integer number (22838760).

Almost surely, 2^865321760 is an apocalyptic number.

865321760 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 865321760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096260480).

865321760 is an abundant number, since it is smaller than the sum of its proper divisors (1327199200).

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

865321760 is a wasteful number, since it uses less digits than its factorization.

865321760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138 (or 4130 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 865321760 is about 29416.3519152189. The cubic root of 865321760 is about 952.9260696506.

The spelling of 865321760 in words is "eight hundred sixty-five million, three hundred twenty-one thousand, seven hundred sixty".