866264 has 32 divisors (see below), whose sum is σ = 1920000. Its totient is φ = 358560.

The previous prime is 866231. The next prime is 866279. The reversal of 866264 is 462668.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 866264.

It is a congruent number.

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, 1487 + ... + 1985.

It is an arithmetic number, because the mean of its divisors is an integer number (60000).

2⁸⁶⁶²⁶⁴ 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 866264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960000).

866264 is an abundant number, since it is smaller than the sum of its proper divisors (1053736).

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

866264 is a wasteful number, since it uses less digits than its factorization.

866264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 539 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 866264 is about 930.7330444333. The cubic root of 866264 is about 95.3271821331.

Adding to 866264 its product of digits (13824), we get a palindrome (880088).

The spelling of 866264 in words is "eight hundred sixty-six thousand, two hundred sixty-four".