28705487 has 2 divisors, whose sum is σ = 28705488. Its totient is φ = 28705486.

The previous prime is 28705427. The next prime is 28705493. The reversal of 28705487 is 78450782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28705487 - 2²⁰ = 27656911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28705427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352743 + 14352744.

It is an arithmetic number, because the mean of its divisors is an integer number (14352744).

Almost surely, 2^28705487 is an apocalyptic number.

28705487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705487 is an equidigital number, since it uses as much as digits as its factorization.

28705487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 28705487 is about 5357.7501808128. The cubic root of 28705487 is about 306.1880989982.

It can be divided in two parts, 28705 and 487, that added together give a palindrome (29192).

The spelling of 28705487 in words is "twenty-eight million, seven hundred five thousand, four hundred eighty-seven".