28579987 has 2 divisors, whose sum is σ = 28579988. Its totient is φ = 28579986.

The previous prime is 28579963. The next prime is 28579997. The reversal of 28579987 is 78997582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28579987 - 2¹⁵ = 28547219 is a prime.

It is not a weakly prime, because it can be changed into another prime (28579927) 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, 14289993 + 14289994.

It is an arithmetic number, because the mean of its divisors is an integer number (14289994).

Almost surely, 2^28579987 is an apocalyptic number.

28579987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28579987 is an equidigital number, since it uses as much as digits as its factorization.

28579987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The square root of 28579987 is about 5346.0253459930. The cubic root of 28579987 is about 305.7412303903.

The spelling of 28579987 in words is "twenty-eight million, five hundred seventy-nine thousand, nine hundred eighty-seven".