266355440 has 80 divisors (see below), whose sum is σ = 670873728. Its totient is φ = 97763328.

The previous prime is 266355431. The next prime is 266355443. The reversal of 266355440 is 44553662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 266355440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266355443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200057 + ... + 201383.

Almost surely, 2^266355440 is an apocalyptic number.

266355440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266355440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335436864).

266355440 is an abundant number, since it is smaller than the sum of its proper divisors (404518288).

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

266355440 is a wasteful number, since it uses less digits than its factorization.

266355440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 266355440 is about 16320.3995049141. The cubic root of 266355440 is about 643.4090872222.

The spelling of 266355440 in words is "two hundred sixty-six million, three hundred fifty-five thousand, four hundred forty".