28143429889 has 2 divisors, whose sum is σ = 28143429890. Its totient is φ = 28143429888.

The previous prime is 28143429833. The next prime is 28143429911. The reversal of 28143429889 is 98892434182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23075129025 + 5068300864 = 151905^2 + 71192^2 .

It is a cyclic number.

It is not a de Polignac number, because 28143429889 - 2²⁵ = 28109875457 is a prime.

It is not a weakly prime, because it can be changed into another prime (28143429829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071714944 + 14071714945.

It is an arithmetic number, because the mean of its divisors is an integer number (14071714945).

Almost surely, 2^28143429889 is an apocalyptic number.

It is an amenable number.

28143429889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28143429889 is an equidigital number, since it uses as much as digits as its factorization.

28143429889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 58.

The spelling of 28143429889 in words is "twenty-eight billion, one hundred forty-three million, four hundred twenty-nine thousand, eight hundred eighty-nine".