266255440 has 40 divisors (see below), whose sum is σ = 675322848. Its totient is φ = 96819840.

The previous prime is 266255399. The next prime is 266255449. The reversal of 266255440 is 44552662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 266255396 and 266255405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266255449) 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, 150402 + ... + 152161.

Almost surely, 2^266255440 is an apocalyptic number.

266255440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266255440 is an abundant number, since it is smaller than the sum of its proper divisors (409067408).

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

266255440 is a wasteful number, since it uses less digits than its factorization.

266255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302587 (or 302581 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 266255440 is about 16317.3355668136. The cubic root of 266255440 is about 643.3285570324.

The spelling of 266255440 in words is "two hundred sixty-six million, two hundred fifty-five thousand, four hundred forty".