28258765081 has 2 divisors, whose sum is σ = 28258765082. Its totient is φ = 28258765080.

The previous prime is 28258765061. The next prime is 28258765111. The reversal of 28258765081 is 18056785282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26549769481 + 1708995600 = 162941^2 + 41340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28258765081 is a prime.

It is a super-2 number, since 2×28258765081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28258765001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129382540 + 14129382541.

It is an arithmetic number, because the mean of its divisors is an integer number (14129382541).

Almost surely, 2^28258765081 is an apocalyptic number.

It is an amenable number.

28258765081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258765081 is an equidigital number, since it uses as much as digits as its factorization.

28258765081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 28258765081 in words is "twenty-eight billion, two hundred fifty-eight million, seven hundred sixty-five thousand, eighty-one".