28821336197 has 2 divisors, whose sum is σ = 28821336198. Its totient is φ = 28821336196.

The previous prime is 28821336163. The next prime is 28821336293. The reversal of 28821336197 is 79163312882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17891470081 + 10929866116 = 133759^2 + 104546^2 .

It is a cyclic number.

It is not a de Polignac number, because 28821336197 - 2²² = 28817141893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28821335197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410668098 + 14410668099.

It is an arithmetic number, because the mean of its divisors is an integer number (14410668099).

Almost surely, 2^28821336197 is an apocalyptic number.

It is an amenable number.

28821336197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28821336197 is an equidigital number, since it uses as much as digits as its factorization.

28821336197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The spelling of 28821336197 in words is "twenty-eight billion, eight hundred twenty-one million, three hundred thirty-six thousand, one hundred ninety-seven".