866873056 has 48 divisors (see below), whose sum is σ = 1955802240. Its totient is φ = 370500480.

The previous prime is 866873053. The next prime is 866873093. The reversal of 866873056 is 650378668.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866873053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79791 + ... + 90001.

It is an arithmetic number, because the mean of its divisors is an integer number (40745880).

Almost surely, 2^866873056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866873056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977901120).

866873056 is an abundant number, since it is smaller than the sum of its proper divisors (1088929184).

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

866873056 is a wasteful number, since it uses less digits than its factorization.

866873056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607 (or 10599 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 866873056 is about 29442.7080276254. The cubic root of 866873056 is about 953.4951789165.

The spelling of 866873056 in words is "eight hundred sixty-six million, eight hundred seventy-three thousand, fifty-six".