28705921271 has 2 divisors, whose sum is σ = 28705921272. Its totient is φ = 28705921270.

The previous prime is 28705921267. The next prime is 28705921303. The reversal of 28705921271 is 17212950782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28705921271 - 2² = 28705921267 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28705921201) 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, 14352960635 + 14352960636.

It is an arithmetic number, because the mean of its divisors is an integer number (14352960636).

Almost surely, 2^28705921271 is an apocalyptic number.

28705921271 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705921271 is an equidigital number, since it uses as much as digits as its factorization.

28705921271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 28705921271 in words is "twenty-eight billion, seven hundred five million, nine hundred twenty-one thousand, two hundred seventy-one".