28881902317 has 2 divisors, whose sum is σ = 28881902318. Its totient is φ = 28881902316.

The previous prime is 28881902303. The next prime is 28881902353. The reversal of 28881902317 is 71320918882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24771297321 + 4110604996 = 157389^2 + 64114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28881902317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28881902377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14440951158 + 14440951159.

It is an arithmetic number, because the mean of its divisors is an integer number (14440951159).

Almost surely, 2^28881902317 is an apocalyptic number.

It is an amenable number.

28881902317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28881902317 is an equidigital number, since it uses as much as digits as its factorization.

28881902317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 28881902317 in words is "twenty-eight billion, eight hundred eighty-one million, nine hundred two thousand, three hundred seventeen".