28387787 has 2 divisors, whose sum is σ = 28387788. Its totient is φ = 28387786.

The previous prime is 28387771. The next prime is 28387861. The reversal of 28387787 is 78778382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28387787 - 2⁴ = 28387771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28387087) 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, 14193893 + 14193894.

It is an arithmetic number, because the mean of its divisors is an integer number (14193894).

Almost surely, 2^28387787 is an apocalyptic number.

28387787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28387787 is an equidigital number, since it uses as much as digits as its factorization.

28387787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 50.

The square root of 28387787 is about 5328.0190502662. The cubic root of 28387787 is about 305.0543198065.

The spelling of 28387787 in words is "twenty-eight million, three hundred eighty-seven thousand, seven hundred eighty-seven".