266394856 has 64 divisors (see below), whose sum is σ = 619476480. Its totient is φ = 104578560.

The previous prime is 266394829. The next prime is 266394929. The reversal of 266394856 is 658493662.

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, 98401 + ... + 101071.

It is an arithmetic number, because the mean of its divisors is an integer number (9679320).

Almost surely, 2^266394856 is an apocalyptic number.

266394856 is a gapful number since it is divisible by the number (26) 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 266394856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309738240).

266394856 is an abundant number, since it is smaller than the sum of its proper divisors (353081624).

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

266394856 is a wasteful number, since it uses less digits than its factorization.

266394856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834 (or 2830 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The square root of 266394856 is about 16321.6070287212. The cubic root of 266394856 is about 643.4408234637.

The spelling of 266394856 in words is "two hundred sixty-six million, three hundred ninety-four thousand, eight hundred fifty-six".