28112338109 has 2 divisors, whose sum is σ = 28112338110. Its totient is φ = 28112338108.

The previous prime is 28112338057. The next prime is 28112338123. The reversal of 28112338109 is 90183321182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27546040900 + 566297209 = 165970^2 + 23797^2 .

It is a cyclic number.

It is not a de Polignac number, because 28112338109 - 2²⁰ = 28111289533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28112338129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14056169054 + 14056169055.

It is an arithmetic number, because the mean of its divisors is an integer number (14056169055).

Almost surely, 2^28112338109 is an apocalyptic number.

It is an amenable number.

28112338109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28112338109 is an equidigital number, since it uses as much as digits as its factorization.

28112338109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 28112338109 in words is "twenty-eight billion, one hundred twelve million, three hundred thirty-eight thousand, one hundred nine".