28879542681889 has 2 divisors, whose sum is σ = 28879542681890. Its totient is φ = 28879542681888.

The previous prime is 28879542681887. The next prime is 28879542681893. The reversal of 28879542681889 is 98818624597882.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23196167737600 + 5683374944289 = 4816240^2 + 2383983^2 .

It is a cyclic number.

It is not a de Polignac number, because 28879542681889 - 2¹ = 28879542681887 is a prime.

Together with 28879542681887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28879542681887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439771340944 + 14439771340945.

It is an arithmetic number, because the mean of its divisors is an integer number (14439771340945).

Almost surely, 2^{28879542681889} is an apocalyptic number.

It is an amenable number.

28879542681889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28879542681889 is an equidigital number, since it uses as much as digits as its factorization.

28879542681889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8918138880, while the sum is 85.

The spelling of 28879542681889 in words is "twenty-eight trillion, eight hundred seventy-nine billion, five hundred forty-two million, six hundred eighty-one thousand, eight hundred eighty-nine".