28719705869 has 2 divisors, whose sum is σ = 28719705870. Its totient is φ = 28719705868.

The previous prime is 28719705851. The next prime is 28719705877. The reversal of 28719705869 is 96850791782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28683825769 + 35880100 = 169363^2 + 5990^2 .

It is a cyclic number.

It is not a de Polignac number, because 28719705869 - 2⁸ = 28719705613 is a prime.

It is a super-2 number, since 2×28719705869² (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 (28719705269) 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, 14359852934 + 14359852935.

It is an arithmetic number, because the mean of its divisors is an integer number (14359852935).

Almost surely, 2^28719705869 is an apocalyptic number.

It is an amenable number.

28719705869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28719705869 is an equidigital number, since it uses as much as digits as its factorization.

28719705869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 28719705869 in words is "twenty-eight billion, seven hundred nineteen million, seven hundred five thousand, eight hundred sixty-nine".