866128836 has 24 divisors (see below), whose sum is σ = 2030551264. Its totient is φ = 287340480.

The previous prime is 866128817. The next prime is 866128843. The reversal of 866128836 is 638821668.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168505 + ... + 173568.

Almost surely, 2^866128836 is an apocalyptic number.

It is an amenable number.

866128836 is an abundant number, since it is smaller than the sum of its proper divisors (1164422428).

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

866128836 is a wasteful number, since it uses less digits than its factorization.

866128836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342291 (or 342289 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 866128836 is about 29430.0668704643. The cubic root of 866128836 is about 953.2222387809. Note that the first 4 decimals are identical.

The spelling of 866128836 in words is "eight hundred sixty-six million, one hundred twenty-eight thousand, eight hundred thirty-six".