266244640 has 48 divisors (see below), whose sum is σ = 629982360. Its totient is φ = 106332160.

The previous prime is 266244617. The next prime is 266244659. The reversal of 266244640 is 46442662.

266244640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 192765456 + 73479184 = 13884^2 + 8572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 266244596 and 266244605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188256 + ... + 189664.

Almost surely, 2^266244640 is an apocalyptic number.

266244640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266244640 is an abundant number, since it is smaller than the sum of its proper divisors (363737720).

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

266244640 is a wasteful number, since it uses less digits than its factorization.

266244640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605 (or 2597 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 266244640 is about 16317.0046270754. The cubic root of 266244640 is about 643.3198585656.

The spelling of 266244640 in words is "two hundred sixty-six million, two hundred forty-four thousand, six hundred forty".