28563195977 has 2 divisors, whose sum is σ = 28563195978. Its totient is φ = 28563195976.

The previous prime is 28563195959. The next prime is 28563196003. The reversal of 28563195977 is 77959136582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17387323321 + 11175872656 = 131861^2 + 105716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28563195977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28563195277) 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, 14281597988 + 14281597989.

It is an arithmetic number, because the mean of its divisors is an integer number (14281597989).

Almost surely, 2^28563195977 is an apocalyptic number.

It is an amenable number.

28563195977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28563195977 is an equidigital number, since it uses as much as digits as its factorization.

28563195977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28576800, while the sum is 62.

The spelling of 28563195977 in words is "twenty-eight billion, five hundred sixty-three million, one hundred ninety-five thousand, nine hundred seventy-seven".