28280280109 has 2 divisors, whose sum is σ = 28280280110. Its totient is φ = 28280280108.

The previous prime is 28280280101. The next prime is 28280280137. The reversal of 28280280109 is 90108208282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28234080900 + 46199209 = 168030^2 + 6797^2 .

It is a cyclic number.

It is not a de Polignac number, because 28280280109 - 2³ = 28280280101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28280280101) 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, 14140140054 + 14140140055.

It is an arithmetic number, because the mean of its divisors is an integer number (14140140055).

Almost surely, 2^28280280109 is an apocalyptic number.

It is an amenable number.

28280280109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280280109 is an equidigital number, since it uses as much as digits as its factorization.

28280280109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 28280280109 in words is "twenty-eight billion, two hundred eighty million, two hundred eighty thousand, one hundred nine".