866784644 has 48 divisors (see below), whose sum is σ = 1799521920. Its totient is φ = 360783360.

The previous prime is 866784643. The next prime is 866784673. The reversal of 866784644 is 446487668.

It is not an unprimeable number, because it can be changed into a prime (866784641) 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 15 ways as a sum of consecutive naturals, for example, 12017 + ... + 43335.

It is an arithmetic number, because the mean of its divisors is an integer number (37490040).

Almost surely, 2^866784644 is an apocalyptic number.

It is an amenable number.

866784644 is an abundant number, since it is smaller than the sum of its proper divisors (932737276).

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

866784644 is a wasteful number, since it uses less digits than its factorization.

866784644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31388 (or 31386 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 53.

The square root of 866784644 is about 29441.2065649491. The cubic root of 866784644 is about 953.4627622970.

The spelling of 866784644 in words is "eight hundred sixty-six million, seven hundred eighty-four thousand, six hundred forty-four".