28780067 has 2 divisors, whose sum is σ = 28780068. Its totient is φ = 28780066.

The previous prime is 28780057. The next prime is 28780109. The reversal of 28780067 is 76008782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28780067 - 2¹⁰ = 28779043 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28780067.

It is not a weakly prime, because it can be changed into another prime (28780057) 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, 14390033 + 14390034.

It is an arithmetic number, because the mean of its divisors is an integer number (14390034).

Almost surely, 2^28780067 is an apocalyptic number.

28780067 is a deficient number, since it is larger than the sum of its proper divisors (1).

28780067 is an equidigital number, since it uses as much as digits as its factorization.

28780067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 28780067 is about 5364.7056769221. The cubic root of 28780067 is about 306.4530397571.

The spelling of 28780067 in words is "twenty-eight million, seven hundred eighty thousand, sixty-seven".