266780500 has 72 divisors (see below), whose sum is σ = 677837160. Its totient is φ = 91459200.

The previous prime is 266780497. The next prime is 266780531. The reversal of 266780500 is 5087662.

It can be written as a sum of positive squares in 4 ways, for example, as 65254084 + 201526416 = 8078^2 + 14196^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19056 + ... + 29944.

It is an arithmetic number, because the mean of its divisors is an integer number (9414405).

Almost surely, 2^266780500 is an apocalyptic number.

266780500 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 266780500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338918580).

266780500 is an abundant number, since it is smaller than the sum of its proper divisors (411056660).

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

266780500 is a wasteful number, since it uses less digits than its factorization.

266780500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922 (or 10903 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 266780500 is about 16333.4166664541. The cubic root of 266780500 is about 643.7511641038.

The spelling of 266780500 in words is "two hundred sixty-six million, seven hundred eighty thousand, five hundred".