228128447 has 2 divisors, whose sum is σ = 228128448. Its totient is φ = 228128446.

The previous prime is 228128441. The next prime is 228128503. The reversal of 228128447 is 744821822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228128447 - 2¹⁶ = 228062911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228128447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228128441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114064223 + 114064224.

It is an arithmetic number, because the mean of its divisors is an integer number (114064224).

Almost surely, 2^228128447 is an apocalyptic number.

228128447 is a deficient number, since it is larger than the sum of its proper divisors (1).

228128447 is an equidigital number, since it uses as much as digits as its factorization.

228128447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57344, while the sum is 38.

The square root of 228128447 is about 15103.9215768621. The cubic root of 228128447 is about 611.0261747434.

The spelling of 228128447 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, four hundred forty-seven".