228128437 has 2 divisors, whose sum is σ = 228128438. Its totient is φ = 228128436.

The previous prime is 228128429. The next prime is 228128441. The reversal of 228128437 is 734821822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198979236 + 29149201 = 14106^2 + 5399^2 .

It is a cyclic number.

It is not a de Polignac number, because 228128437 - 2³ = 228128429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228128396 and 228128405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228128447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114064218 + 114064219.

It is an arithmetic number, because the mean of its divisors is an integer number (114064219).

Almost surely, 2^228128437 is an apocalyptic number.

It is an amenable number.

228128437 is a deficient number, since it is larger than the sum of its proper divisors (1).

228128437 is an equidigital number, since it uses as much as digits as its factorization.

228128437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 228128437 is about 15103.9212458222. The cubic root of 228128437 is about 611.0261658153.

The spelling of 228128437 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, four hundred thirty-seven".