28788787 has 2 divisors, whose sum is σ = 28788788. Its totient is φ = 28788786.

The previous prime is 28788763. The next prime is 28788827. The reversal of 28788787 is 78788782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28788787 - 2⁷ = 28788659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28788187) 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, 14394393 + 14394394.

It is an arithmetic number, because the mean of its divisors is an integer number (14394394).

Almost surely, 2^28788787 is an apocalyptic number.

28788787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28788787 is an equidigital number, since it uses as much as digits as its factorization.

28788787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2809856, while the sum is 55.

The square root of 28788787 is about 5365.5183346998. The cubic root of 28788787 is about 306.4839871099.

The spelling of 28788787 in words is "twenty-eight million, seven hundred eighty-eight thousand, seven hundred eighty-seven".