266008240 has 40 divisors (see below), whose sum is σ = 622437840. Its totient is φ = 105720576.

The previous prime is 266008229. The next prime is 266008261. The reversal of 266008240 is 42800662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 266008199 and 266008208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1971 + ... + 23149.

It is an arithmetic number, because the mean of its divisors is an integer number (15560946).

Almost surely, 2^266008240 is an apocalyptic number.

266008240 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 266008240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311218920).

266008240 is an abundant number, since it is smaller than the sum of its proper divisors (356429600).

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

266008240 is a wasteful number, since it uses less digits than its factorization.

266008240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21349 (or 21343 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 266008240 is about 16309.7590417517. The cubic root of 266008240 is about 643.1293998357.

The spelling of 266008240 in words is "two hundred sixty-six million, eight thousand, two hundred forty".