228472889 has 4 divisors (see below), whose sum is σ = 233786256. Its totient is φ = 223159524.

The previous prime is 228472847. The next prime is 228472897. The reversal of 228472889 is 988274822.

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, and also an emirpimes, since its reverse is a distinct semiprime: 988274822 = 2 ⋅494137411.

It is a cyclic number.

It is not a de Polignac number, because 228472889 - 2¹⁶ = 228407353 is a prime.

It is a super-2 number, since 2×228472889² = 104399722016012642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228472589) 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, 2656619 + ... + 2656704.

It is an arithmetic number, because the mean of its divisors is an integer number (58446564).

Almost surely, 2^228472889 is an apocalyptic number.

It is an amenable number.

228472889 is a deficient number, since it is larger than the sum of its proper divisors (5313367).

228472889 is an equidigital number, since it uses as much as digits as its factorization.

228472889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313366.

The product of its digits is 1032192, while the sum is 50.

The square root of 228472889 is about 15115.3196790541. The cubic root of 228472889 is about 611.3335414133. Note that the first 3 decimals are identical.

The spelling of 228472889 in words is "two hundred twenty-eight million, four hundred seventy-two thousand, eight hundred eighty-nine".