228455309 has 8 divisors (see below), whose sum is σ = 233903928. Its totient is φ = 223061760.

The previous prime is 228455303. The next prime is 228455317. The reversal of 228455309 is 903554822.

It can be written as a sum of positive squares in 4 ways, for example, as 34633225 + 193822084 = 5885^2 + 13922^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228455309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228455303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5312 + ... + 22025.

It is an arithmetic number, because the mean of its divisors is an integer number (29237991).

Almost surely, 2^228455309 is an apocalyptic number.

It is an amenable number.

228455309 is a deficient number, since it is larger than the sum of its proper divisors (5448619).

228455309 is a wasteful number, since it uses less digits than its factorization.

228455309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27535.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 228455309 is about 15114.7381386513. The cubic root of 228455309 is about 611.3178611877.

The spelling of 228455309 in words is "two hundred twenty-eight million, four hundred fifty-five thousand, three hundred nine".