228040705 has 4 divisors (see below), whose sum is σ = 273648852. Its totient is φ = 182432560.

The previous prime is 228040693. The next prime is 228040721. The reversal of 228040705 is 507040822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137733696 + 90307009 = 11736^2 + 9503^2 .

It is not a de Polignac number, because 228040705 - 2⁷ = 228040577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22804066 + ... + 22804075.

It is an arithmetic number, because the mean of its divisors is an integer number (68412213).

Almost surely, 2^228040705 is an apocalyptic number.

It is an amenable number.

228040705 is a deficient number, since it is larger than the sum of its proper divisors (45608147).

228040705 is an equidigital number, since it uses as much as digits as its factorization.

228040705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45608146.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 228040705 is about 15101.0166876274. The cubic root of 228040705 is about 610.9478277504.

The spelling of 228040705 in words is "two hundred twenty-eight million, forty thousand, seven hundred five".