266290 has 16 divisors (see below), whose sum is σ = 495360. Its totient is φ = 102960.

The previous prime is 266281. The next prime is 266291. The reversal of 266290 is 92662.

It is a super-5 number, since 5×266290⁵ (a number of 28 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (266291) 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, 120 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (30960).

2²⁶⁶²⁹⁰ is an apocalyptic number.

266290 is a deficient number, since it is larger than the sum of its proper divisors (229070).

266290 is a wasteful number, since it uses less digits than its factorization.

266290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 266290 is about 516.0329446847. The cubic root of 266290 is about 64.3356390546.

The spelling of 266290 in words is "two hundred sixty-six thousand, two hundred ninety".