866766 has 8 divisors (see below), whose sum is σ = 1733544. Its totient is φ = 288920.

The previous prime is 866759. The next prime is 866777. The reversal of 866766 is 667668.

866766 = 464² + 465² + ... + 467².

It is a sphenic number, since it is the product of 3 distinct primes.

866766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72225 + ... + 72236.

It is an arithmetic number, because the mean of its divisors is an integer number (216693).

2⁸⁶⁶⁷⁶⁶ is an apocalyptic number.

866766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

866766 is a wasteful number, since it uses less digits than its factorization.

866766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144466.

The product of its digits is 72576, while the sum is 39.

The square root of 866766 is about 931.0026852808. The cubic root of 866766 is about 95.3455926117.

The spelling of 866766 in words is "eight hundred sixty-six thousand, seven hundred sixty-six".