866321128 has 16 divisors (see below), whose sum is σ = 1694976480. Its totient is φ = 414327408.

The previous prime is 866321123. The next prime is 866321177. The reversal of 866321128 is 821123668.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (866321123) 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 3 ways as a sum of consecutive naturals, for example, 2353950 + ... + 2354317.

It is an arithmetic number, because the mean of its divisors is an integer number (105936030).

Almost surely, 2^866321128 is an apocalyptic number.

It is an amenable number.

866321128 is a deficient number, since it is larger than the sum of its proper divisors (828655352).

866321128 is a wasteful number, since it uses less digits than its factorization.

866321128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708296 (or 4708292 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 866321128 is about 29433.3336202340. Note that the first 3 decimals coincide. The cubic root of 866321128 is about 953.2927761882.

It can be divided in two parts, 8663 and 21128, that added together give a cube (29791 = 31³).

The spelling of 866321128 in words is "eight hundred sixty-six million, three hundred twenty-one thousand, one hundred twenty-eight".