28455680777 has 2 divisors, whose sum is σ = 28455680778. Its totient is φ = 28455680776.

The previous prime is 28455680723. The next prime is 28455680791. The reversal of 28455680777 is 77708655482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23708608576 + 4747072201 = 153976^2 + 68899^2 .

It is a cyclic number.

It is not a de Polignac number, because 28455680777 - 2¹⁰ = 28455679753 is a prime.

It is not a weakly prime, because it can be changed into another prime (28455680717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14227840388 + 14227840389.

It is an arithmetic number, because the mean of its divisors is an integer number (14227840389).

Almost surely, 2^28455680777 is an apocalyptic number.

It is an amenable number.

28455680777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28455680777 is an equidigital number, since it uses as much as digits as its factorization.

28455680777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26342400, while the sum is 59.

The spelling of 28455680777 in words is "twenty-eight billion, four hundred fifty-five million, six hundred eighty thousand, seven hundred seventy-seven".