28067891 has 2 divisors, whose sum is σ = 28067892. Its totient is φ = 28067890.

The previous prime is 28067887. The next prime is 28067939. The reversal of 28067891 is 19876082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28067891 - 2² = 28067887 is a prime.

It is not a weakly prime, because it can be changed into another prime (28067801) 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, 14033945 + 14033946.

It is an arithmetic number, because the mean of its divisors is an integer number (14033946).

Almost surely, 2^28067891 is an apocalyptic number.

28067891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28067891 is an equidigital number, since it uses as much as digits as its factorization.

28067891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28067891 is about 5297.9138347089. The cubic root of 28067891 is about 303.9041241690.

The spelling of 28067891 in words is "twenty-eight million, sixty-seven thousand, eight hundred ninety-one".