228788005 has 4 divisors (see below), whose sum is σ = 274545612. Its totient is φ = 183030400.

The previous prime is 228787981. The next prime is 228788009. The reversal of 228788005 is 500887822.

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 102292996 + 126495009 = 10114^2 + 11247^2 .

It is not a de Polignac number, because 228788005 - 2⁵ = 228787973 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228788009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22878796 + ... + 22878805.

It is an arithmetic number, because the mean of its divisors is an integer number (68636403).

Almost surely, 2^228788005 is an apocalyptic number.

It is an amenable number.

228788005 is a deficient number, since it is larger than the sum of its proper divisors (45757607).

228788005 is an equidigital number, since it uses as much as digits as its factorization.

228788005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45757606.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 228788005 is about 15125.7398166172. The cubic root of 228788005 is about 611.6144682279.

The spelling of 228788005 in words is "two hundred twenty-eight million, seven hundred eighty-eight thousand, five".