7728928209071 has 2 divisors, whose sum is σ = 7728928209072. Its totient is φ = 7728928209070.

The previous prime is 7728928208959. The next prime is 7728928209103. The reversal of 7728928209071 is 1709028298277.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7728928209071 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 7728928208995 and 7728928209013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7728928259071) 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, 3864464104535 + 3864464104536.

It is an arithmetic number, because the mean of its divisors is an integer number (3864464104536).

Almost surely, 2^{7728928209071} is an apocalyptic number.

7728928209071 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728928209071 is an equidigital number, since it uses as much as digits as its factorization.

7728928209071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 7728928209071 in words is "seven trillion, seven hundred twenty-eight billion, nine hundred twenty-eight million, two hundred nine thousand, seventy-one".