28188609637 has 2 divisors, whose sum is σ = 28188609638. Its totient is φ = 28188609636.

The previous prime is 28188609599. The next prime is 28188609643. The reversal of 28188609637 is 73690688182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27449531041 + 739078596 = 165679^2 + 27186^2 .

It is a cyclic number.

It is not a de Polignac number, because 28188609637 - 2²⁷ = 28054391909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28188609037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14094304818 + 14094304819.

It is an arithmetic number, because the mean of its divisors is an integer number (14094304819).

Almost surely, 2^28188609637 is an apocalyptic number.

It is an amenable number.

28188609637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28188609637 is an equidigital number, since it uses as much as digits as its factorization.

28188609637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 28188609637 in words is "twenty-eight billion, one hundred eighty-eight million, six hundred nine thousand, six hundred thirty-seven".