28357688861 has 2 divisors, whose sum is σ = 28357688862. Its totient is φ = 28357688860.

The previous prime is 28357688833. The next prime is 28357688881. The reversal of 28357688861 is 16888675382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24654966361 + 3702722500 = 157019^2 + 60850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28357688861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28357688794 and 28357688803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28357688881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178844430 + 14178844431.

It is an arithmetic number, because the mean of its divisors is an integer number (14178844431).

Almost surely, 2^28357688861 is an apocalyptic number.

It is an amenable number.

28357688861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357688861 is an equidigital number, since it uses as much as digits as its factorization.

28357688861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30965760, while the sum is 62.

The spelling of 28357688861 in words is "twenty-eight billion, three hundred fifty-seven million, six hundred eighty-eight thousand, eight hundred sixty-one".