866016 has 72 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 276480.

The previous prime is 866011. The next prime is 866029. The reversal of 866016 is 610668.

866016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866011) by changing a digit.

866016 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8880 + ... + 8976.

It is an arithmetic number, because the mean of its divisors is an integer number (35672).

2⁸⁶⁶⁰¹⁶ 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 866016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1284192).

866016 is an abundant number, since it is smaller than the sum of its proper divisors (1702368).

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

866016 is a wasteful number, since it uses less digits than its factorization.

866016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 866016 is about 930.5998065764. The cubic root of 866016 is about 95.3180842916.

The spelling of 866016 in words is "eight hundred sixty-six thousand, sixteen".