866683188 has 108 divisors (see below), whose sum is σ = 2698464132. Its totient is φ = 233049600.

The previous prime is 866683187. The next prime is 866683193. The reversal of 866683188 is 881386668.

It can be written as a sum of positive squares in 2 ways, for example, as 813276324 + 53406864 = 28518^2 + 7308^2 .

It is a super-2 number, since 2×866683188² = 1502279496723686688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866683187) 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 35 ways as a sum of consecutive naturals, for example, 15538 + ... + 44438.

It is an arithmetic number, because the mean of its divisors is an integer number (24985779).

Almost surely, 2^866683188 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 866683188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349232066).

866683188 is an abundant number, since it is smaller than the sum of its proper divisors (1831780944).

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

866683188 is a wasteful number, since it uses less digits than its factorization.

866683188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28942 (or 28930 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 866683188 is about 29439.4834873168. The cubic root of 866683188 is about 953.4255603257.

The spelling of 866683188 in words is "eight hundred sixty-six million, six hundred eighty-three thousand, one hundred eighty-eight".