228216809 has 4 divisors (see below), whose sum is σ = 240228240. Its totient is φ = 216205380.

The previous prime is 228216797. The next prime is 228216839. The reversal of 228216809 is 908612822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228216809 - 2⁸ = 228216553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228216839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6005687 + ... + 6005724.

It is an arithmetic number, because the mean of its divisors is an integer number (60057060).

Almost surely, 2^228216809 is an apocalyptic number.

It is an amenable number.

228216809 is a deficient number, since it is larger than the sum of its proper divisors (12011431).

228216809 is a wasteful number, since it uses less digits than its factorization.

228216809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011430.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 228216809 is about 15106.8464280273. The cubic root of 228216809 is about 611.1050550499.

It can be divided in two parts, 2282 and 16809, that added together give a palindrome (19091).

The spelling of 228216809 in words is "two hundred twenty-eight million, two hundred sixteen thousand, eight hundred nine".