28372249 has 2 divisors, whose sum is σ = 28372250. Its totient is φ = 28372248.

The previous prime is 28372247. The next prime is 28372261. The reversal of 28372249 is 94227382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25938649 + 2433600 = 5093^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 28372249 - 2¹ = 28372247 is a prime.

Together with 28372247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28372243) 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, 14186124 + 14186125.

It is an arithmetic number, because the mean of its divisors is an integer number (14186125).

Almost surely, 2^28372249 is an apocalyptic number.

It is an amenable number.

28372249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372249 is an equidigital number, since it uses as much as digits as its factorization.

28372249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 28372249 is about 5326.5607102520. The cubic root of 28372249 is about 304.9986526860.

The spelling of 28372249 in words is "twenty-eight million, three hundred seventy-two thousand, two hundred forty-nine".