266237440 has 160 divisors (see below), whose sum is σ = 742452480. Its totient is φ = 89677824.

The previous prime is 266237437. The next prime is 266237483. The reversal of 266237440 is 44732662.

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 266237396 and 266237405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1487271 + ... + 1487449.

It is an arithmetic number, because the mean of its divisors is an integer number (4640328).

Almost surely, 2^266237440 is an apocalyptic number.

266237440 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 266237440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371226240).

266237440 is an abundant number, since it is smaller than the sum of its proper divisors (476215040).

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

266237440 is an equidigital number, since it uses as much as digits as its factorization.

266237440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 266237440 is about 16316.7839968543. The cubic root of 266237440 is about 643.3140594570.

The spelling of 266237440 in words is "two hundred sixty-six million, two hundred thirty-seven thousand, four hundred forty".