28021038109 has 2 divisors, whose sum is σ = 28021038110. Its totient is φ = 28021038108.

The previous prime is 28021038047. The next prime is 28021038173. The reversal of 28021038109 is 90183012082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27973566009 + 47472100 = 167253^2 + 6890^2 .

It is a cyclic number.

It is not a de Polignac number, because 28021038109 - 2²⁵ = 27987483677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28021038179) 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, 14010519054 + 14010519055.

It is an arithmetic number, because the mean of its divisors is an integer number (14010519055).

Almost surely, 2^28021038109 is an apocalyptic number.

It is an amenable number.

28021038109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28021038109 is an equidigital number, since it uses as much as digits as its factorization.

28021038109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 28021038109 in words is "twenty-eight billion, twenty-one million, thirty-eight thousand, one hundred nine".