28587317309 has 2 divisors, whose sum is σ = 28587317310. Its totient is φ = 28587317308.

The previous prime is 28587317303. The next prime is 28587317371. The reversal of 28587317309 is 90371378582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23630453284 + 4956864025 = 153722^2 + 70405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28587317309 - 2²⁴ = 28570540093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28587317303) 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, 14293658654 + 14293658655.

It is an arithmetic number, because the mean of its divisors is an integer number (14293658655).

Almost surely, 2^28587317309 is an apocalyptic number.

It is an amenable number.

28587317309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28587317309 is an equidigital number, since it uses as much as digits as its factorization.

28587317309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 28587317309 in words is "twenty-eight billion, five hundred eighty-seven million, three hundred seventeen thousand, three hundred nine".