266328240 has 160 divisors (see below), whose sum is σ = 855588096. Its totient is φ = 68490240.

The previous prime is 266328229. The next prime is 266328259. The reversal of 266328240 is 42823662.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1351822 + ... + 1352018.

Almost surely, 2^266328240 is an apocalyptic number.

266328240 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 266328240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (427794048).

266328240 is an abundant number, since it is smaller than the sum of its proper divisors (589259856).

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

266328240 is a wasteful number, since it uses less digits than its factorization.

266328240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 266328240 is about 16319.5661707044. The cubic root of 266328240 is about 643.3871850065.

It can be divided in two parts, 2663 and 28240, that added together give a palindrome (30903).

The spelling of 266328240 in words is "two hundred sixty-six million, three hundred twenty-eight thousand, two hundred forty".