28809717787 has 2 divisors, whose sum is σ = 28809717788. Its totient is φ = 28809717786.

The previous prime is 28809717773. The next prime is 28809717857. The reversal of 28809717787 is 78771790882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28809717787 - 2²⁷ = 28675500059 is a prime.

It is not a weakly prime, because it can be changed into another prime (28809717707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14404858893 + 14404858894.

It is an arithmetic number, because the mean of its divisors is an integer number (14404858894).

Almost surely, 2^28809717787 is an apocalyptic number.

28809717787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28809717787 is an equidigital number, since it uses as much as digits as its factorization.

28809717787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22127616, while the sum is 64.

The spelling of 28809717787 in words is "twenty-eight billion, eight hundred nine million, seven hundred seventeen thousand, seven hundred eighty-seven".