266305806 has 120 divisors (see below), whose sum is σ = 660038544. Its totient is φ = 80196480.

The previous prime is 266305801. The next prime is 266305813. The reversal of 266305806 is 608503662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266305801) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1943770 + ... + 1943906.

Almost surely, 2^266305806 is an apocalyptic number.

266305806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 266305806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330019272).

266305806 is an abundant number, since it is smaller than the sum of its proper divisors (393732738).

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

266305806 is a wasteful number, since it uses less digits than its factorization.

266305806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 266305806 is about 16318.8788217818. The cubic root of 266305806 is about 643.3691193877.

The spelling of 266305806 in words is "two hundred sixty-six million, three hundred five thousand, eight hundred six".