28958711891 has 2 divisors, whose sum is σ = 28958711892. Its totient is φ = 28958711890.

The previous prime is 28958711857. The next prime is 28958711921. The reversal of 28958711891 is 19811785982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28958711891 - 2¹⁸ = 28958449747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28958711891.

It is not a weakly prime, because it can be changed into another prime (28958711491) 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, 14479355945 + 14479355946.

It is an arithmetic number, because the mean of its divisors is an integer number (14479355946).

Almost surely, 2^28958711891 is an apocalyptic number.

28958711891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28958711891 is an equidigital number, since it uses as much as digits as its factorization.

28958711891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 59.

The spelling of 28958711891 in words is "twenty-eight billion, nine hundred fifty-eight million, seven hundred eleven thousand, eight hundred ninety-one".