266531320 has 64 divisors (see below), whose sum is σ = 665366400. Its totient is φ = 95268480.

The previous prime is 266531281. The next prime is 266531323. The reversal of 266531320 is 23135662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266531323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20827 + ... + 31093.

It is an arithmetic number, because the mean of its divisors is an integer number (10396350).

Almost surely, 2^266531320 is an apocalyptic number.

266531320 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 266531320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332683200).

266531320 is an abundant number, since it is smaller than the sum of its proper divisors (398835080).

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

266531320 is a wasteful number, since it uses less digits than its factorization.

266531320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10348 (or 10344 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 266531320 is about 16325.7869641864. The cubic root of 266531320 is about 643.5506748335.

Adding to 266531320 its reverse (23135662), we get a palindrome (289666982).

The spelling of 266531320 in words is "two hundred sixty-six million, five hundred thirty-one thousand, three hundred twenty".