266690 has 8 divisors (see below), whose sum is σ = 480060. Its totient is φ = 106672.

The previous prime is 266689. The next prime is 266701. The reversal of 266690 is 96662.

It is a happy number.

266690 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 17689 = 499^2 + 133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×266690² = 142247112200, which contains 22 as substring.

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, 13325 + ... + 13344.

2²⁶⁶⁶⁹⁰ is an apocalyptic number.

266690 is a deficient number, since it is larger than the sum of its proper divisors (213370).

266690 is a wasteful number, since it uses less digits than its factorization.

266690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26676.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 266690 is about 516.4203714030. The cubic root of 266690 is about 64.3678362594.

The spelling of 266690 in words is "two hundred sixty-six thousand, six hundred ninety".