28278330809 has 2 divisors, whose sum is σ = 28278330810. Its totient is φ = 28278330808.

The previous prime is 28278330767. The next prime is 28278330827. The reversal of 28278330809 is 90803387282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21479833600 + 6798497209 = 146560^2 + 82453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28278330809 is a prime.

It is not a weakly prime, because it can be changed into another prime (28278330709) 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, 14139165404 + 14139165405.

It is an arithmetic number, because the mean of its divisors is an integer number (14139165405).

Almost surely, 2^28278330809 is an apocalyptic number.

It is an amenable number.

28278330809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28278330809 is an equidigital number, since it uses as much as digits as its factorization.

28278330809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 28278330809 in words is "twenty-eight billion, two hundred seventy-eight million, three hundred thirty thousand, eight hundred nine".