28908241 has 2 divisors, whose sum is σ = 28908242. Its totient is φ = 28908240.

The previous prime is 28908221. The next prime is 28908251. The reversal of 28908241 is 14280982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27867841 + 1040400 = 5279^2 + 1020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28908241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28908197 and 28908206.

It is not a weakly prime, because it can be changed into another prime (28908221) 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, 14454120 + 14454121.

It is an arithmetic number, because the mean of its divisors is an integer number (14454121).

Almost surely, 2^28908241 is an apocalyptic number.

It is an amenable number.

28908241 is a deficient number, since it is larger than the sum of its proper divisors (1).

28908241 is an equidigital number, since it uses as much as digits as its factorization.

28908241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 28908241 is about 5376.6384479524. The cubic root of 28908241 is about 306.9073025950.

The spelling of 28908241 in words is "twenty-eight million, nine hundred eight thousand, two hundred forty-one".