28911328961 has 2 divisors, whose sum is σ = 28911328962. Its totient is φ = 28911328960.

The previous prime is 28911328951. The next prime is 28911329003. The reversal of 28911328961 is 16982311982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21544368400 + 7366960561 = 146780^2 + 85831^2 .

It is a cyclic number.

It is not a de Polignac number, because 28911328961 - 2¹⁰ = 28911327937 is a prime.

It is not a weakly prime, because it can be changed into another prime (28911328951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14455664480 + 14455664481.

It is an arithmetic number, because the mean of its divisors is an integer number (14455664481).

Almost surely, 2^28911328961 is an apocalyptic number.

It is an amenable number.

28911328961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28911328961 is an equidigital number, since it uses as much as digits as its factorization.

28911328961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 50.

The spelling of 28911328961 in words is "twenty-eight billion, nine hundred eleven million, three hundred twenty-eight thousand, nine hundred sixty-one".