28715138269 has 2 divisors, whose sum is σ = 28715138270. Its totient is φ = 28715138268.

The previous prime is 28715138261. The next prime is 28715138323. The reversal of 28715138269 is 96283151782.

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., 20381274169 + 8333864100 = 142763^2 + 91290^2 .

It is a cyclic number.

It is not a de Polignac number, because 28715138269 - 2³ = 28715138261 is a prime.

It is a super-2 number, since 2×28715138269² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28715138261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357569134 + 14357569135.

It is an arithmetic number, because the mean of its divisors is an integer number (14357569135).

Almost surely, 2^28715138269 is an apocalyptic number.

It is an amenable number.

28715138269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28715138269 is an equidigital number, since it uses as much as digits as its factorization.

28715138269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

It can be divided in two parts, 2871513 and 8269, that added together give a palindrome (2879782).

The spelling of 28715138269 in words is "twenty-eight billion, seven hundred fifteen million, one hundred thirty-eight thousand, two hundred sixty-nine".