865545912 has 480 divisors, whose sum is σ = 3244348800. Its totient is φ = 210418560.

The previous prime is 865545907. The next prime is 865545929. The reversal of 865545912 is 219545568.

865545912 is a `hidden beast` number, since 8 + 6 + 5 + 54 + 591 + 2 = 666.

Its product of digits (432000) is a multiple of the sum of its prime divisors (125).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 10428223 + ... + 10428305.

It is an arithmetic number, because the mean of its divisors is an integer number (6759060).

Almost surely, 2^865545912 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 865545912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1622174400).

865545912 is an abundant number, since it is smaller than the sum of its proper divisors (2378802888).

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

865545912 is a wasteful number, since it uses less digits than its factorization.

865545912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 125 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 865545912 is about 29420.1616582914. The cubic root of 865545912 is about 953.0083441884.

The spelling of 865545912 in words is "eight hundred sixty-five million, five hundred forty-five thousand, nine hundred twelve".