266864 has 20 divisors (see below), whose sum is σ = 557256. Its totient is φ = 123072.

The previous prime is 266863. The next prime is 266867. The reversal of 266864 is 468662.

It is a happy number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 266864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434 + ... + 849.

2²⁶⁶⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

266864 is an abundant number, since it is smaller than the sum of its proper divisors (290392).

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

266864 is a wasteful number, since it uses less digits than its factorization.

266864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1298 counting only the distinct ones).

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

The square root of 266864 is about 516.5888113384. The cubic root of 266864 is about 64.3818319956.

It can be divided in two parts, 2 and 66864, that added together give a palindrome (66866).

The spelling of 266864 in words is "two hundred sixty-six thousand, eight hundred sixty-four".