866491028 has 48 divisors (see below), whose sum is σ = 1657313280. Its totient is φ = 394015104.

The previous prime is 866490997. The next prime is 866491057. The reversal of 866491028 is 820194668.

It is a happy number.

866491028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 866491028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1181750 + ... + 1182482.

It is an arithmetic number, because the mean of its divisors is an integer number (34527360).

Almost surely, 2^866491028 is an apocalyptic number.

It is an amenable number.

866491028 is a deficient number, since it is larger than the sum of its proper divisors (790822252).

866491028 is a wasteful number, since it uses less digits than its factorization.

866491028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 866491028 is about 29436.2196621781. The cubic root of 866491028 is about 953.3550909776.

The spelling of 866491028 in words is "eight hundred sixty-six million, four hundred ninety-one thousand, twenty-eight".