866536 has 32 divisors (see below), whose sum is σ = 1821600. Its totient is φ = 383040.

The previous prime is 866519. The next prime is 866573. The reversal of 866536 is 635668.

866536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3670 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (56925).

2⁸⁶⁶⁵³⁶ is an apocalyptic number.

866536 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910800).

866536 is an abundant number, since it is smaller than the sum of its proper divisors (955064).

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

866536 is a wasteful number, since it uses less digits than its factorization.

866536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 285 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 866536 is about 930.8791543482. The cubic root of 866536 is about 95.3371584145.

The spelling of 866536 in words is "eight hundred sixty-six thousand, five hundred thirty-six".