28888235991 has 12 divisors (see below), whose sum is σ = 41755532832. Its totient is φ = 19245863616.

The previous prime is 28888235989. The next prime is 28888236023. The reversal of 28888235991 is 19953288882.

It is not a de Polignac number, because 28888235991 - 2¹ = 28888235989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28888235951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1065906 + ... + 1092671.

It is an arithmetic number, because the mean of its divisors is an integer number (3479627736).

Almost surely, 2^28888235991 is an apocalyptic number.

28888235991 is a deficient number, since it is larger than the sum of its proper divisors (12867296841).

28888235991 is a wasteful number, since it uses less digits than its factorization.

28888235991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160070 (or 2160067 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The spelling of 28888235991 in words is "twenty-eight billion, eight hundred eighty-eight million, two hundred thirty-five thousand, nine hundred ninety-one".