266520 has 32 divisors (see below), whose sum is σ = 799920. Its totient is φ = 71040.

The previous prime is 266491. The next prime is 266521. The reversal of 266520 is 25662.

266520 is nontrivially palindromic in base 11.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991 + ... + 1230.

2²⁶⁶⁵²⁰ is an apocalyptic number.

266520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266520 is an abundant number, since it is smaller than the sum of its proper divisors (533400).

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

266520 is a wasteful number, since it uses less digits than its factorization.

266520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 266520 is about 516.2557505733. The cubic root of 266520 is about 64.3541563838.

The spelling of 266520 in words is "two hundred sixty-six thousand, five hundred twenty".