266380 has 24 divisors (see below), whose sum is σ = 589680. Its totient is φ = 100800.

The previous prime is 266369. The next prime is 266381. The reversal of 266380 is 83662.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (266381) by changing a digit.

266380 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 30 + ... + 730.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2²⁶⁶³⁸⁰ is an apocalyptic number.

266380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294840).

266380 is an abundant number, since it is smaller than the sum of its proper divisors (323300).

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

266380 is a wasteful number, since it uses less digits than its factorization.

266380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 266380 is about 516.1201410524. The cubic root of 266380 is about 64.3428862354.

It can be divided in two parts, 266 and 380, that added together give a palindrome (646).

The spelling of 266380 in words is "two hundred sixty-six thousand, three hundred eighty".