28319867 has 2 divisors, whose sum is σ = 28319868. Its totient is φ = 28319866.

The previous prime is 28319821. The next prime is 28319873. The reversal of 28319867 is 76891382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28319867 - 2²⁴ = 11542651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28319267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14159933 + 14159934.

It is an arithmetic number, because the mean of its divisors is an integer number (14159934).

Almost surely, 2^28319867 is an apocalyptic number.

28319867 is a deficient number, since it is larger than the sum of its proper divisors (1).

28319867 is an equidigital number, since it uses as much as digits as its factorization.

28319867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28319867 is about 5321.6413821301. The cubic root of 28319867 is about 304.8108367484.

The spelling of 28319867 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred sixty-seven".