228729889 has 4 divisors (see below), whose sum is σ = 229086256. Its totient is φ = 228373524.

The previous prime is 228729887. The next prime is 228729899. The reversal of 228729889 is 988927822.

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: 988927822 = 2 ⋅494463911.

It is a cyclic number.

It is not a de Polignac number, because 228729889 - 2¹ = 228729887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228729887) 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, 177219 + ... + 178504.

It is an arithmetic number, because the mean of its divisors is an integer number (57271564).

Almost surely, 2^228729889 is an apocalyptic number.

It is an amenable number.

228729889 is a deficient number, since it is larger than the sum of its proper divisors (356367).

228729889 is an equidigital number, since it uses as much as digits as its factorization.

228729889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356366.

The product of its digits is 2322432, while the sum is 55.

The square root of 228729889 is about 15123.8185984889. The cubic root of 228729889 is about 611.5626770563.

It can be divided in two parts, 22872 and 9889, that added together give a square (32761 = 181²).

The spelling of 228729889 in words is "two hundred twenty-eight million, seven hundred twenty-nine thousand, eight hundred eighty-nine".