226640305 has 4 divisors (see below), whose sum is σ = 271968372. Its totient is φ = 181312240.

The previous prime is 226640291. The next prime is 226640327. The reversal of 226640305 is 503046622.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64256256 + 162384049 = 8016^2 + 12743^2 .

It is not a de Polignac number, because 226640305 - 2¹⁷ = 226509233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22664026 + ... + 22664035.

It is an arithmetic number, because the mean of its divisors is an integer number (67992093).

Almost surely, 2^226640305 is an apocalyptic number.

It is an amenable number.

226640305 is a deficient number, since it is larger than the sum of its proper divisors (45328067).

226640305 is an equidigital number, since it uses as much as digits as its factorization.

226640305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45328066.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 226640305 is about 15054.5775430598. The cubic root of 226640305 is about 609.6946469573.

Adding to 226640305 its reverse (503046622), we get a palindrome (729686927).

The spelling of 226640305 in words is "two hundred twenty-six million, six hundred forty thousand, three hundred five".