28923311309 has 2 divisors, whose sum is σ = 28923311310. Its totient is φ = 28923311308.

The previous prime is 28923311303. The next prime is 28923311323. The reversal of 28923311309 is 90311332982.

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., 24086108809 + 4837202500 = 155197^2 + 69550^2 .

It is a cyclic number.

It is not a de Polignac number, because 28923311309 - 2²⁸ = 28654875853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28923311303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14461655654 + 14461655655.

It is an arithmetic number, because the mean of its divisors is an integer number (14461655655).

Almost surely, 2^28923311309 is an apocalyptic number.

It is an amenable number.

28923311309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28923311309 is an equidigital number, since it uses as much as digits as its factorization.

28923311309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 28923311309 in words is "twenty-eight billion, nine hundred twenty-three million, three hundred eleven thousand, three hundred nine".