28308120161 has 2 divisors, whose sum is σ = 28308120162. Its totient is φ = 28308120160.

The previous prime is 28308120151. The next prime is 28308120209. The reversal of 28308120161 is 16102180382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26547814225 + 1760305936 = 162935^2 + 41956^2 .

It is a cyclic number.

It is not a de Polignac number, because 28308120161 - 2⁶ = 28308120097 is a prime.

It is a super-2 number, since 2×28308120161² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28308120101) 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, 14154060080 + 14154060081.

It is an arithmetic number, because the mean of its divisors is an integer number (14154060081).

Almost surely, 2^28308120161 is an apocalyptic number.

It is an amenable number.

28308120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28308120161 is an equidigital number, since it uses as much as digits as its factorization.

28308120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 28308120161 in words is "twenty-eight billion, three hundred eight million, one hundred twenty thousand, one hundred sixty-one".