28348335721 has 2 divisors, whose sum is σ = 28348335722. Its totient is φ = 28348335720.

The previous prime is 28348335641. The next prime is 28348335731. The reversal of 28348335721 is 12753384382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19538448400 + 8809887321 = 139780^2 + 93861^2 .

It is a cyclic number.

It is not a de Polignac number, because 28348335721 - 2¹³ = 28348327529 is a prime.

It is not a weakly prime, because it can be changed into another prime (28348335731) 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, 14174167860 + 14174167861.

It is an arithmetic number, because the mean of its divisors is an integer number (14174167861).

Almost surely, 2^28348335721 is an apocalyptic number.

It is an amenable number.

28348335721 is a deficient number, since it is larger than the sum of its proper divisors (1).

28348335721 is an equidigital number, since it uses as much as digits as its factorization.

28348335721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 46.

The spelling of 28348335721 in words is "twenty-eight billion, three hundred forty-eight million, three hundred thirty-five thousand, seven hundred twenty-one".