28878958189 has 2 divisors, whose sum is σ = 28878958190. Its totient is φ = 28878958188.

The previous prime is 28878958187. The next prime is 28878958201. The reversal of 28878958189 is 98185987882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28343406025 + 535552164 = 168355^2 + 23142^2 .

It is a cyclic number.

It is not a de Polignac number, because 28878958189 - 2¹ = 28878958187 is a prime.

Together with 28878958187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28878958187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439479094 + 14439479095.

It is an arithmetic number, because the mean of its divisors is an integer number (14439479095).

Almost surely, 2^28878958189 is an apocalyptic number.

It is an amenable number.

28878958189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28878958189 is an equidigital number, since it uses as much as digits as its factorization.

28878958189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185794560, while the sum is 73.

The spelling of 28878958189 in words is "twenty-eight billion, eight hundred seventy-eight million, nine hundred fifty-eight thousand, one hundred eighty-nine".