866868 has 48 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 267904.

The previous prime is 866857. The next prime is 866869. The reversal of 866868 is 868668.

866868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16330 + ... + 16382.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁸⁶⁶⁸⁶⁸ 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 866868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

866868 is an abundant number, since it is smaller than the sum of its proper divisors (1310412).

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

866868 is a wasteful number, since it uses less digits than its factorization.

866868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 134 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 866868 is about 931.0574633179. The cubic root of 866868 is about 95.3493325173.

The spelling of 866868 in words is "eight hundred sixty-six thousand, eight hundred sixty-eight".