266317320 has 64 divisors (see below), whose sum is σ = 801342720. Its totient is φ = 70805504.

The previous prime is 266317313. The next prime is 266317321. The reversal of 266317320 is 23713662.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (266317321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39217 + ... + 45503.

It is an arithmetic number, because the mean of its divisors is an integer number (12520980).

Almost surely, 2^266317320 is an apocalyptic number.

266317320 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 266317320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (400671360).

266317320 is an abundant number, since it is smaller than the sum of its proper divisors (535025400).

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

266317320 is a wasteful number, since it uses less digits than its factorization.

266317320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654 (or 6650 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 266317320 is about 16319.2315995576. The cubic root of 266317320 is about 643.3783914915.

The spelling of 266317320 in words is "two hundred sixty-six million, three hundred seventeen thousand, three hundred twenty".