266990208 has 64 divisors (see below), whose sum is σ = 713469600. Its totient is φ = 88460288.

The previous prime is 266990189. The next prime is 266990209. The reversal of 266990208 is 802099662.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 266990208.

It is not an unprimeable number, because it can be changed into a prime (266990209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64423 + ... + 68441.

Almost surely, 2^266990208 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 266990208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356734800).

266990208 is an abundant number, since it is smaller than the sum of its proper divisors (446479392).

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

266990208 is a wasteful number, since it uses less digits than its factorization.

266990208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209 (or 4197 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 266990208 is about 16339.8350052869. The cubic root of 266990208 is about 643.9197976328.

The spelling of 266990208 in words is "two hundred sixty-six million, nine hundred ninety thousand, two hundred eight".