266780256 has 48 divisors (see below), whose sum is σ = 716595264. Its totient is φ = 86857344.

The previous prime is 266780219. The next prime is 266780257. The reversal of 266780256 is 652087662.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266780257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28186 + ... + 36441.

It is an arithmetic number, because the mean of its divisors is an integer number (14929068).

Almost surely, 2^266780256 is an apocalyptic number.

It is an amenable number.

266780256 is an abundant number, since it is smaller than the sum of its proper divisors (449815008).

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

266780256 is a wasteful number, since it uses less digits than its factorization.

266780256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64683 (or 64675 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 266780256 is about 16333.4091971027. The cubic root of 266780256 is about 643.7509678435.

The spelling of 266780256 in words is "two hundred sixty-six million, seven hundred eighty thousand, two hundred fifty-six".