28127058109 has 2 divisors, whose sum is σ = 28127058110. Its totient is φ = 28127058108.

The previous prime is 28127058103. The next prime is 28127058143. The reversal of 28127058109 is 90185072182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26608786884 + 1518271225 = 163122^2 + 38965^2 .

It is a cyclic number.

It is not a de Polignac number, because 28127058109 - 2⁹ = 28127057597 is a prime.

It is a super-2 number, since 2×28127058109² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28127058103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14063529054 + 14063529055.

It is an arithmetic number, because the mean of its divisors is an integer number (14063529055).

Almost surely, 2^28127058109 is an apocalyptic number.

It is an amenable number.

28127058109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28127058109 is an equidigital number, since it uses as much as digits as its factorization.

28127058109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 28127058109 in words is "twenty-eight billion, one hundred twenty-seven million, fifty-eight thousand, one hundred nine".