215305266 has 16 divisors (see below), whose sum is σ = 469757088. Its totient is φ = 65244000.

The previous prime is 215305249. The next prime is 215305267. The reversal of 215305266 is 662503512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215305267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631035 + ... + 1631166.

It is an arithmetic number, because the mean of its divisors is an integer number (29359818).

Almost surely, 2^215305266 is an apocalyptic number.

215305266 is an abundant number, since it is smaller than the sum of its proper divisors (254451822).

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

215305266 is a wasteful number, since it uses less digits than its factorization.

215305266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262217.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 215305266 is about 14673.2840904823. The cubic root of 215305266 is about 599.3560368775.

Adding to 215305266 its reverse (662503512), we get a palindrome (877808778).

It can be divided in two parts, 21530 and 5266, that added together give a triangular number (26796 = T₂₃₁).

The spelling of 215305266 in words is "two hundred fifteen million, three hundred five thousand, two hundred sixty-six".