866775789 has 16 divisors (see below), whose sum is σ = 1400850240. Its totient is φ = 525318480.

The previous prime is 866775781. The next prime is 866775823. The reversal of 866775789 is 987577668.

It is not a de Polignac number, because 866775789 - 2³ = 866775781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866775781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1458922 + ... + 1459515.

It is an arithmetic number, because the mean of its divisors is an integer number (87553140).

Almost surely, 2^866775789 is an apocalyptic number.

It is an amenable number.

866775789 is a deficient number, since it is larger than the sum of its proper divisors (534074451).

866775789 is a wasteful number, since it uses less digits than its factorization.

866775789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918457 (or 2918451 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The square root of 866775789 is about 29441.0561801033. The cubic root of 866775789 is about 953.4595154538.

The spelling of 866775789 in words is "eight hundred sixty-six million, seven hundred seventy-five thousand, seven hundred eighty-nine".