228333909 has 4 divisors (see below), whose sum is σ = 304445216. Its totient is φ = 152222604.

The previous prime is 228333899. The next prime is 228333929. The reversal of 228333909 is 909333822.

228333909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 228333909 - 2⁴ = 228333893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228333929) 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, 38055649 + ... + 38055654.

It is an arithmetic number, because the mean of its divisors is an integer number (76111304).

Almost surely, 2^228333909 is an apocalyptic number.

It is an amenable number.

228333909 is a deficient number, since it is larger than the sum of its proper divisors (76111307).

228333909 is an equidigital number, since it uses as much as digits as its factorization.

228333909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76111306.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 228333909 is about 15110.7216571546. The cubic root of 228333909 is about 611.2095582579.

The spelling of 228333909 in words is "two hundred twenty-eight million, three hundred thirty-three thousand, nine hundred nine".