266128 has 10 divisors (see below), whose sum is σ = 515654. Its totient is φ = 133056.

The previous prime is 266117. The next prime is 266129. The reversal of 266128 is 821662.

It can be written as a sum of positive squares in only one way, i.e., 183184 + 82944 = 428^2 + 288^2 .

It is a super-2 number, since 2×266128² = 141648224768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266129) by changing a digit.

266128 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8301 + ... + 8332.

2²⁶⁶¹²⁸ is an apocalyptic number.

It is an amenable number.

266128 is a deficient number, since it is larger than the sum of its proper divisors (249526).

266128 is a wasteful number, since it uses less digits than its factorization.

266128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16641 (or 16635 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 266128 is about 515.8759540820. The cubic root of 266128 is about 64.3225900131.

The spelling of 266128 in words is "two hundred sixty-six thousand, one hundred twenty-eight".