266816 has 28 divisors (see below), whose sum is σ = 579120. Its totient is φ = 120960.

The previous prime is 266801. The next prime is 266821. The reversal of 266816 is 618662.

It is a pancake number, because a pancake can be divided into 266816 parts by 730 straight cuts.

It is an unprimeable number.

266816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515 + ... + 893.

2²⁶⁶⁸¹⁶ 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 266816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289560).

266816 is an abundant number, since it is smaller than the sum of its proper divisors (312304).

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

266816 is a wasteful number, since it uses less digits than its factorization.

266816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 392 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 266816 is about 516.5423506355. The cubic root of 266816 is about 64.3779717106.

The spelling of 266816 in words is "two hundred sixty-six thousand, eight hundred sixteen".