266013440 has 144 divisors (see below), whose sum is σ = 794707200. Its totient is φ = 82882560.

The previous prime is 266013439. The next prime is 266013457. The reversal of 266013440 is 44310662.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97211 + ... + 99909.

It is an arithmetic number, because the mean of its divisors is an integer number (5518800).

Almost surely, 2^266013440 is an apocalyptic number.

266013440 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 266013440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397353600).

266013440 is an abundant number, since it is smaller than the sum of its proper divisors (528693760).

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

266013440 is a wasteful number, since it uses less digits than its factorization.

266013440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738 (or 2724 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 266013440 is about 16309.9184547318. The cubic root of 266013440 is about 643.1335904967.

The spelling of 266013440 in words is "two hundred sixty-six million, thirteen thousand, four hundred forty".