28129243 has 2 divisors, whose sum is σ = 28129244. Its totient is φ = 28129242.

The previous prime is 28129229. The next prime is 28129249. The reversal of 28129243 is 34292182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28129243 is a prime.

It is not a weakly prime, because it can be changed into another prime (28129249) 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, 14064621 + 14064622.

It is an arithmetic number, because the mean of its divisors is an integer number (14064622).

Almost surely, 2^28129243 is an apocalyptic number.

28129243 is a deficient number, since it is larger than the sum of its proper divisors (1).

28129243 is an equidigital number, since it uses as much as digits as its factorization.

28129243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 28129243 is about 5303.7008776891. The cubic root of 28129243 is about 304.1253919182.

The spelling of 28129243 in words is "twenty-eight million, one hundred twenty-nine thousand, two hundred forty-three".