266620872 has 64 divisors (see below), whose sum is σ = 773176320. Its totient is φ = 75037248.

The previous prime is 266620859. The next prime is 266620891. The reversal of 266620872 is 278026662.

It is a self number, because there is not a number n which added to its sum of digits gives 266620872.

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, 588 + ... + 23099.

It is an arithmetic number, because the mean of its divisors is an integer number (12080880).

Almost surely, 2^266620872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266620872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386588160).

266620872 is an abundant number, since it is smaller than the sum of its proper divisors (506555448).

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

266620872 is a wasteful number, since it uses less digits than its factorization.

266620872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23770 (or 23766 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 266620872 is about 16328.5293887723. The cubic root of 266620872 is about 643.6227424073.

The spelling of 266620872 in words is "two hundred sixty-six million, six hundred twenty thousand, eight hundred seventy-two".