28025772769 has 2 divisors, whose sum is σ = 28025772770. Its totient is φ = 28025772768.

The previous prime is 28025772763. The next prime is 28025772793. The reversal of 28025772769 is 96727752082.

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., 26996133025 + 1029639744 = 164305^2 + 32088^2 .

It is a cyclic number.

It is not a de Polignac number, because 28025772769 - 2⁵ = 28025772737 is a prime.

It is a super-2 number, since 2×28025772769² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28025772763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14012886384 + 14012886385.

It is an arithmetic number, because the mean of its divisors is an integer number (14012886385).

Almost surely, 2^28025772769 is an apocalyptic number.

It is an amenable number.

28025772769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28025772769 is an equidigital number, since it uses as much as digits as its factorization.

28025772769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 28025772769 in words is "twenty-eight billion, twenty-five million, seven hundred seventy-two thousand, seven hundred sixty-nine".