228681909 has 24 divisors (see below), whose sum is σ = 356360472. Its totient is φ = 140774400.

The previous prime is 228681899. The next prime is 228681913. The reversal of 228681909 is 909186822.

228681909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 103734225 + 124947684 = 10185^2 + 11178^2 .

It is not a de Polignac number, because 228681909 - 2⁷ = 228681781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228681949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5992 + ... + 22209.

It is an arithmetic number, because the mean of its divisors is an integer number (14848353).

Almost surely, 2^228681909 is an apocalyptic number.

It is an amenable number.

228681909 is a deficient number, since it is larger than the sum of its proper divisors (127678563).

228681909 is a wasteful number, since it uses less digits than its factorization.

228681909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28277 (or 28274 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 228681909 is about 15122.2322756926. The cubic root of 228681909 is about 611.5199121611.

The spelling of 228681909 in words is "two hundred twenty-eight million, six hundred eighty-one thousand, nine hundred nine".