28696022209 has 2 divisors, whose sum is σ = 28696022210. Its totient is φ = 28696022208.

The previous prime is 28696022207. The next prime is 28696022227. The reversal of 28696022209 is 90222069682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18983328400 + 9712693809 = 137780^2 + 98553^2 .

It is a cyclic number.

It is not a de Polignac number, because 28696022209 - 2¹ = 28696022207 is a prime.

Together with 28696022207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28696022207) 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, 14348011104 + 14348011105.

It is an arithmetic number, because the mean of its divisors is an integer number (14348011105).

Almost surely, 2^28696022209 is an apocalyptic number.

It is an amenable number.

28696022209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28696022209 is an equidigital number, since it uses as much as digits as its factorization.

28696022209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 28696022209 in words is "twenty-eight billion, six hundred ninety-six million, twenty-two thousand, two hundred nine".