28446557779 has 2 divisors, whose sum is σ = 28446557780. Its totient is φ = 28446557778.

The previous prime is 28446557771. The next prime is 28446557809. The reversal of 28446557779 is 97775564482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28446557779 - 2³ = 28446557771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28446557779.

It is not a weakly prime, because it can be changed into another prime (28446557771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14223278889 + 14223278890.

It is an arithmetic number, because the mean of its divisors is an integer number (14223278890).

Almost surely, 2^28446557779 is an apocalyptic number.

28446557779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28446557779 is an equidigital number, since it uses as much as digits as its factorization.

28446557779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118540800, while the sum is 64.

The spelling of 28446557779 in words is "twenty-eight billion, four hundred forty-six million, five hundred fifty-seven thousand, seven hundred seventy-nine".