266328640 has 56 divisors (see below), whose sum is σ = 636495552. Its totient is φ = 106145280.

The previous prime is 266328619. The next prime is 266328653. The reversal of 266328640 is 46823662.

It is a self number, because there is not a number n which added to its sum of digits gives 266328640.

It is a congruent number.

It is an unprimeable number.

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, 96885 + ... + 99595.

It is an arithmetic number, because the mean of its divisors is an integer number (11365992).

Almost surely, 2^266328640 is an apocalyptic number.

266328640 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 266328640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318247776).

266328640 is an abundant number, since it is smaller than the sum of its proper divisors (370166912).

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

266328640 is a wasteful number, since it uses less digits than its factorization.

266328640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035 (or 3025 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 266328640 is about 16319.5784259276. The cubic root of 266328640 is about 643.3875071087.

The spelling of 266328640 in words is "two hundred sixty-six million, three hundred twenty-eight thousand, six hundred forty".