28080280769 has 2 divisors, whose sum is σ = 28080280770. Its totient is φ = 28080280768.

The previous prime is 28080280729. The next prime is 28080280793. The reversal of 28080280769 is 96708208082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21028480144 + 7051800625 = 145012^2 + 83975^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080280769 - 2³² = 23785313473 is a prime.

It is a super-2 number, since 2×28080280769² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28080280729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040140384 + 14040140385.

It is an arithmetic number, because the mean of its divisors is an integer number (14040140385).

Almost surely, 2^28080280769 is an apocalyptic number.

It is an amenable number.

28080280769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080280769 is an equidigital number, since it uses as much as digits as its factorization.

28080280769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 28080280769 in words is "twenty-eight billion, eighty million, two hundred eighty thousand, seven hundred sixty-nine".