28838242991 has 2 divisors, whose sum is σ = 28838242992. Its totient is φ = 28838242990.

The previous prime is 28838242969. The next prime is 28838243023. The reversal of 28838242991 is 19924283882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28838242991 - 2²⁶ = 28771134127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28838242591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14419121495 + 14419121496.

It is an arithmetic number, because the mean of its divisors is an integer number (14419121496).

Almost surely, 2^28838242991 is an apocalyptic number.

28838242991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28838242991 is an equidigital number, since it uses as much as digits as its factorization.

28838242991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 56.

The spelling of 28838242991 in words is "twenty-eight billion, eight hundred thirty-eight million, two hundred forty-two thousand, nine hundred ninety-one".