228128773 has 2 divisors, whose sum is σ = 228128774. Its totient is φ = 228128772.

The previous prime is 228128759. The next prime is 228128827. The reversal of 228128773 is 377821822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147452449 + 80676324 = 12143^2 + 8982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228128773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228128713) 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 as a sum of consecutive naturals, namely, 114064386 + 114064387.

It is an arithmetic number, because the mean of its divisors is an integer number (114064387).

Almost surely, 2^228128773 is an apocalyptic number.

It is an amenable number.

228128773 is a deficient number, since it is larger than the sum of its proper divisors (1).

228128773 is an equidigital number, since it uses as much as digits as its factorization.

228128773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 40.

The square root of 228128773 is about 15103.9323687575. The cubic root of 228128773 is about 611.0264657994.

The spelling of 228128773 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, seven hundred seventy-three".