28289690129 has 2 divisors, whose sum is σ = 28289690130. Its totient is φ = 28289690128.

The previous prime is 28289690101. The next prime is 28289690137. The reversal of 28289690129 is 92109698282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15556824529 + 12732865600 = 124727^2 + 112840^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289690129 - 2²⁰ = 28288641553 is a prime.

It is not a weakly prime, because it can be changed into another prime (28289690629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144845064 + 14144845065.

It is an arithmetic number, because the mean of its divisors is an integer number (14144845065).

Almost surely, 2^28289690129 is an apocalyptic number.

It is an amenable number.

28289690129 is a deficient number, since it is larger than the sum of its proper divisors (1).

28289690129 is an equidigital number, since it uses as much as digits as its factorization.

28289690129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 28289690129 in words is "twenty-eight billion, two hundred eighty-nine million, six hundred ninety thousand, one hundred twenty-nine".