228257905 has 4 divisors (see below), whose sum is σ = 273909492. Its totient is φ = 182606320.

The previous prime is 228257903. The next prime is 228257941. The reversal of 228257905 is 509752822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509752822 = 2 ⋅254876411.

It can be written as a sum of positive squares in 2 ways, for example, as 83320384 + 144937521 = 9128^2 + 12039^2 .

It is not a de Polignac number, because 228257905 - 2¹ = 228257903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228257903) 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, 22825786 + ... + 22825795.

It is an arithmetic number, because the mean of its divisors is an integer number (68477373).

Almost surely, 2^228257905 is an apocalyptic number.

It is an amenable number.

228257905 is a deficient number, since it is larger than the sum of its proper divisors (45651587).

228257905 is an equidigital number, since it uses as much as digits as its factorization.

228257905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45651586.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 228257905 is about 15108.2065447888. The cubic root of 228257905 is about 611.1417343026.

The spelling of 228257905 in words is "two hundred twenty-eight million, two hundred fifty-seven thousand, nine hundred five".