266580820 has 24 divisors (see below), whose sum is σ = 610712928. Its totient is φ = 96938400.

The previous prime is 266580799. The next prime is 266580823. The reversal of 266580820 is 28085662.

It is a self number, because there is not a number n which added to its sum of digits gives 266580820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266580823) 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 7 ways as a sum of consecutive naturals, for example, 605646 + ... + 606085.

It is an arithmetic number, because the mean of its divisors is an integer number (25446372).

Almost surely, 2^266580820 is an apocalyptic number.

266580820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266580820 is an abundant number, since it is smaller than the sum of its proper divisors (344132108).

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

266580820 is a wasteful number, since it uses less digits than its factorization.

266580820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211751 (or 1211749 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 266580820 is about 16327.3029003568. The cubic root of 266580820 is about 643.5905122862.

The spelling of 266580820 in words is "two hundred sixty-six million, five hundred eighty thousand, eight hundred twenty".