228332809 has 4 divisors (see below), whose sum is σ = 234504004. Its totient is φ = 222161616.

The previous prime is 228332807. The next prime is 228332833. The reversal of 228332809 is 908233822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908233822 = 2 ⋅454116911.

It can be written as a sum of positive squares in 2 ways, for example, as 186923584 + 41409225 = 13672^2 + 6435^2 .

It is not a de Polignac number, because 228332809 - 2¹ = 228332807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 6171157 = 228332809 / (2 + 2 + 8 + 3 + 3 + 2 + 8 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228332801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3085542 + ... + 3085615.

It is an arithmetic number, because the mean of its divisors is an integer number (58626001).

Almost surely, 2^228332809 is an apocalyptic number.

It is an amenable number.

228332809 is a deficient number, since it is larger than the sum of its proper divisors (6171195).

228332809 is an equidigital number, since it uses as much as digits as its factorization.

228332809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171194.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 228332809 is about 15110.6852591138. The cubic root of 228332809 is about 611.2085767544.

The spelling of 228332809 in words is "two hundred twenty-eight million, three hundred thirty-two thousand, eight hundred nine".