228432905 has 4 divisors (see below), whose sum is σ = 274119492. Its totient is φ = 182746320.

The previous prime is 228432901. The next prime is 228432907. The reversal of 228432905 is 509234822.

228432905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509234822 = 2 ⋅254617411.

It can be written as a sum of positive squares in 2 ways, for example, as 181387024 + 47045881 = 13468^2 + 6859^2 .

It is not a de Polignac number, because 228432905 - 2² = 228432901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228432901) 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, 22843286 + ... + 22843295.

It is an arithmetic number, because the mean of its divisors is an integer number (68529873).

Almost surely, 2^228432905 is an apocalyptic number.

It is an amenable number.

228432905 is a deficient number, since it is larger than the sum of its proper divisors (45686587).

228432905 is an equidigital number, since it uses as much as digits as its factorization.

228432905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45686586.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 228432905 is about 15113.9969895458. The cubic root of 228432905 is about 611.2978770996.

The spelling of 228432905 in words is "two hundred twenty-eight million, four hundred thirty-two thousand, nine hundred five".