28004887 has 2 divisors, whose sum is σ = 28004888. Its totient is φ = 28004886.

The previous prime is 28004857. The next prime is 28004909. The reversal of 28004887 is 78840082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28004887 - 2¹¹ = 28002839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28004857) 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, 14002443 + 14002444.

It is an arithmetic number, because the mean of its divisors is an integer number (14002444).

Almost surely, 2^28004887 is an apocalyptic number.

28004887 is a deficient number, since it is larger than the sum of its proper divisors (1).

28004887 is an equidigital number, since it uses as much as digits as its factorization.

28004887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 28004887 is about 5291.9643800766. The cubic root of 28004887 is about 303.6765626007.

The spelling of 28004887 in words is "twenty-eight million, four thousand, eight hundred eighty-seven".