28208947171 has 2 divisors, whose sum is σ = 28208947172. Its totient is φ = 28208947170.

The previous prime is 28208947163. The next prime is 28208947201. The reversal of 28208947171 is 17174980282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28208947171 - 2³ = 28208947163 is a prime.

It is not a weakly prime, because it can be changed into another prime (28208947111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104473585 + 14104473586.

It is an arithmetic number, because the mean of its divisors is an integer number (14104473586).

Almost surely, 2^28208947171 is an apocalyptic number.

28208947171 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208947171 is an equidigital number, since it uses as much as digits as its factorization.

28208947171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 28208947171 in words is "twenty-eight billion, two hundred eight million, nine hundred forty-seven thousand, one hundred seventy-one".