28705000057 has 2 divisors, whose sum is σ = 28705000058. Its totient is φ = 28705000056.

The previous prime is 28705000039. The next prime is 28705000147. The reversal of 28705000057 is 75000050782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26120701161 + 2584298896 = 161619^2 + 50836^2 .

It is a cyclic number.

It is not a de Polignac number, because 28705000057 - 2³¹ = 26557516409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28704999986 and 28705000031.

It is not a weakly prime, because it can be changed into another prime (28705600057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352500028 + 14352500029.

It is an arithmetic number, because the mean of its divisors is an integer number (14352500029).

Almost surely, 2^28705000057 is an apocalyptic number.

It is an amenable number.

28705000057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705000057 is an equidigital number, since it uses as much as digits as its factorization.

28705000057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 34.

The spelling of 28705000057 in words is "twenty-eight billion, seven hundred five million, fifty-seven", and thus it is an aban number.