228644289 has 18 divisors (see below), whose sum is σ = 342958850. Its totient is φ = 152425152.

The previous prime is 228644263. The next prime is 228644291. The reversal of 228644289 is 982446822.

It can be written as a sum of positive squares in only one way, i.e., 134165889 + 94478400 = 11583^2 + 9720^2 .

It is not a de Polignac number, because 228644289 - 2¹² = 228640193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228644089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10864 + ... + 23985.

Almost surely, 2^228644289 is an apocalyptic number.

It is an amenable number.

228644289 is a deficient number, since it is larger than the sum of its proper divisors (114314561).

228644289 is an frugal number, since it uses more digits than its factorization.

228644289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34873 (or 34852 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 228644289 is about 15120.9883605537. The cubic root of 228644289 is about 611.4863770193.

The spelling of 228644289 in words is "two hundred twenty-eight million, six hundred forty-four thousand, two hundred eighty-nine".