28928361691 has 2 divisors, whose sum is σ = 28928361692. Its totient is φ = 28928361690.

The previous prime is 28928361659. The next prime is 28928361703. The reversal of 28928361691 is 19616382982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28928361691 - 2⁵ = 28928361659 is a prime.

It is a super-2 number, since 2×28928361691² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28928361611) 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, 14464180845 + 14464180846.

It is an arithmetic number, because the mean of its divisors is an integer number (14464180846).

Almost surely, 2^28928361691 is an apocalyptic number.

28928361691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28928361691 is an equidigital number, since it uses as much as digits as its factorization.

28928361691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 55.

The spelling of 28928361691 in words is "twenty-eight billion, nine hundred twenty-eight million, three hundred sixty-one thousand, six hundred ninety-one".