868660 has 36 divisors (see below), whose sum is σ = 1982988. Its totient is φ = 319488.

The previous prime is 868639. The next prime is 868663. The reversal of 868660 is 66868.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14884 + 853776 = 122^2 + 924^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3252 + ... + 3508.

It is an arithmetic number, because the mean of its divisors is an integer number (55083).

2⁸⁶⁸⁶⁶⁰ 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 868660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991494).

868660 is an abundant number, since it is smaller than the sum of its proper divisors (1114328).

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

868660 is a wasteful number, since it uses less digits than its factorization.

868660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 868660 is about 932.0193131046. The cubic root of 868660 is about 95.4149897262.

The spelling of 868660 in words is "eight hundred sixty-eight thousand, six hundred sixty".