266407840 has 48 divisors (see below), whose sum is σ = 630414792. Its totient is φ = 106389504.

The previous prime is 266407811. The next prime is 266407847. The reversal of 266407840 is 48704662.

266407840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 146023056 + 120384784 = 12084^2 + 10972^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 266407840.

It is not an unprimeable number, because it can be changed into a prime (266407847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149032 + ... + 150808.

Almost surely, 2^266407840 is an apocalyptic number.

266407840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266407840 is an abundant number, since it is smaller than the sum of its proper divisors (364006952).

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

266407840 is a wasteful number, since it uses less digits than its factorization.

266407840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 266407840 is about 16322.0047788254. The cubic root of 266407840 is about 643.4512769938.

The spelling of 266407840 in words is "two hundred sixty-six million, four hundred seven thousand, eight hundred forty".