866600 has 48 divisors (see below), whose sum is σ = 2306400. Its totient is φ = 296640.

The previous prime is 866581. The next prime is 866623. The reversal of 866600 is 6668.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 866600.

It is an unprimeable number.

866600 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, 1091 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (48050).

2⁸⁶⁶⁶⁰⁰ 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 866600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153200).

866600 is an abundant number, since it is smaller than the sum of its proper divisors (1439800).

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

866600 is a wasteful number, since it uses less digits than its factorization.

866600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 866600 is about 930.9135298190. The cubic root of 866600 is about 95.3395054714.

The spelling of 866600 in words is "eight hundred sixty-six thousand, six hundred".