266890 has 16 divisors (see below), whose sum is σ = 517608. Its totient is φ = 98496.

The previous prime is 266867. The next prime is 266891. The reversal of 266890 is 98662.

It can be written as a sum of positive squares in 4 ways, for example, as 168921 + 97969 = 411^2 + 313^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266891) 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, 897 + ... + 1156.

2²⁶⁶⁸⁹⁰ is an apocalyptic number.

266890 is a deficient number, since it is larger than the sum of its proper divisors (250718).

266890 is a wasteful number, since it uses less digits than its factorization.

266890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 266890 is about 516.6139758079. The cubic root of 266890 is about 64.3839227900.

It can be divided in two parts, 266 and 890, that added together give a square (1156 = 34²).

The spelling of 266890 in words is "two hundred sixty-six thousand, eight hundred ninety".