266720 has 24 divisors (see below), whose sum is σ = 630504. Its totient is φ = 106624.

The previous prime is 266719. The next prime is 266759. The reversal of 266720 is 27662.

It is a happy number.

It is a super-2 number, since 2×266720² = 142279116800, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266720.

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, 674 + ... + 993.

It is an arithmetic number, because the mean of its divisors is an integer number (26271).

2²⁶⁶⁷²⁰ is an apocalyptic number.

266720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266720 is an abundant number, since it is smaller than the sum of its proper divisors (363784).

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

266720 is a wasteful number, since it uses less digits than its factorization.

266720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 266720 is about 516.4494166905. The cubic root of 266720 is about 64.3702497516.

The spelling of 266720 in words is "two hundred sixty-six thousand, seven hundred twenty".