28375583728181 has 2 divisors, whose sum is σ = 28375583728182. Its totient is φ = 28375583728180.

The previous prime is 28375583728169. The next prime is 28375583728223. The reversal of 28375583728181 is 18182738557382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19760425372900 + 8615158355281 = 4445270^2 + 2935159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28375583728181 - 2¹⁰ = 28375583727157 is a prime.

It is a super-2 number, since 2×28375583728181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28375583728081) 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, 14187791864090 + 14187791864091.

It is an arithmetic number, because the mean of its divisors is an integer number (14187791864091).

Almost surely, 2^{28375583728181} is an apocalyptic number.

It is an amenable number.

28375583728181 is a deficient number, since it is larger than the sum of its proper divisors (1).

28375583728181 is an equidigital number, since it uses as much as digits as its factorization.

28375583728181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180633600, while the sum is 68.

The spelling of 28375583728181 in words is "twenty-eight trillion, three hundred seventy-five billion, five hundred eighty-three million, seven hundred twenty-eight thousand, one hundred eighty-one".