28001819 has 2 divisors, whose sum is σ = 28001820. Its totient is φ = 28001818.

The previous prime is 28001789. The next prime is 28001821. The reversal of 28001819 is 91810082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28001819 is a prime.

It is a super-2 number, since 2×28001819² = 1568203734617522, which contains 22 as substring.

Together with 28001821, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28001791 and 28001800.

It is not a weakly prime, because it can be changed into another prime (28001899) 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, 14000909 + 14000910.

It is an arithmetic number, because the mean of its divisors is an integer number (14000910).

Almost surely, 2^28001819 is an apocalyptic number.

28001819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28001819 is an equidigital number, since it uses as much as digits as its factorization.

28001819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 28001819 is about 5291.6744986819. The cubic root of 28001819 is about 303.6654727063.

The spelling of 28001819 in words is "twenty-eight million, one thousand, eight hundred nineteen".