266805840 has 320 divisors, whose sum is σ = 1005649920. Its totient is φ = 57231360.

The previous prime is 266805811. The next prime is 266805857. The reversal of 266805840 is 48508662.

266805840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2447706 + ... + 2447814.

It is an arithmetic number, because the mean of its divisors is an integer number (3142656).

Almost surely, 2^266805840 is an apocalyptic number.

266805840 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 266805840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502824960).

266805840 is an abundant number, since it is smaller than the sum of its proper divisors (738844080).

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

266805840 is a wasteful number, since it uses less digits than its factorization.

266805840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 266805840 is about 16334.1923583629. The cubic root of 266805840 is about 643.7715455761.

The spelling of 266805840 in words is "two hundred sixty-six million, eight hundred five thousand, eight hundred forty".