28509898111 has 2 divisors, whose sum is σ = 28509898112. Its totient is φ = 28509898110.

The previous prime is 28509898097. The next prime is 28509898169. The reversal of 28509898111 is 11189890582.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28509898111 - 2²³ = 28501509503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28509898181) 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, 14254949055 + 14254949056.

It is an arithmetic number, because the mean of its divisors is an integer number (14254949056).

Almost surely, 2^28509898111 is an apocalyptic number.

28509898111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28509898111 is an equidigital number, since it uses as much as digits as its factorization.

28509898111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 52.

The spelling of 28509898111 in words is "twenty-eight billion, five hundred nine million, eight hundred ninety-eight thousand, one hundred eleven".