266490 has 80 divisors (see below), whose sum is σ = 836352. Its totient is φ = 59616.

The previous prime is 266489. The next prime is 266491. The reversal of 266490 is 94662.

It is an interprime number because it is at equal distance from previous prime (266489) and next prime (266491).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266491) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5647 + ... + 5693.

2²⁶⁶⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418176).

266490 is an abundant number, since it is smaller than the sum of its proper divisors (569862).

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

266490 is a wasteful number, since it uses less digits than its factorization.

266490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 266490 is about 516.2266943892. The cubic root of 266490 is about 64.3517416843.

266490 divided by its sum of digits (27) gives a triangular number (9870 = T₁₄₀).

The spelling of 266490 in words is "two hundred sixty-six thousand, four hundred ninety".