266644 has 24 divisors (see below), whose sum is σ = 544320. Its totient is φ = 111936.

The previous prime is 266641. The next prime is 266647. The reversal of 266644 is 446662.

It is an interprime number because it is at equal distance from previous prime (266641) and next prime (266647).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2439 + ... + 2545.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2²⁶⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

266644 is an abundant number, since it is smaller than the sum of its proper divisors (277676).

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

266644 is a wasteful number, since it uses less digits than its factorization.

266644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 205 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 266644 is about 516.3758321223. The cubic root of 266644 is about 64.3641352199.

It can be divided in two parts, 26 and 6644, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 266644 in words is "two hundred sixty-six thousand, six hundred forty-four".