266321328 has 160 divisors (see below), whose sum is σ = 891609600. Its totient is φ = 66521088.

The previous prime is 266321323. The next prime is 266321333. The reversal of 266321328 is 823123662.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (266321323) and next prime (266321333).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (266321323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81388 + ... + 84596.

It is an arithmetic number, because the mean of its divisors is an integer number (5572560).

Almost surely, 2^266321328 is an apocalyptic number.

266321328 is a gapful number since it is divisible by the number (28) 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 266321328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445804800).

266321328 is an abundant number, since it is smaller than the sum of its proper divisors (625288272).

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

266321328 is a wasteful number, since it uses less digits than its factorization.

266321328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259 (or 3253 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 266321328 is about 16319.3543989951. The cubic root of 266321328 is about 643.3816190294.

The spelling of 266321328 in words is "two hundred sixty-six million, three hundred twenty-one thousand, three hundred twenty-eight".