28728571801 has 2 divisors, whose sum is σ = 28728571802. Its totient is φ = 28728571800.

The previous prime is 28728571787. The next prime is 28728571831. The reversal of 28728571801 is 10817582782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25424621401 + 3303950400 = 159451^2 + 57480^2 .

It is a cyclic number.

It is not a de Polignac number, because 28728571801 - 2⁷ = 28728571673 is a prime.

It is not a weakly prime, because it can be changed into another prime (28728571831) 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, 14364285900 + 14364285901.

It is an arithmetic number, because the mean of its divisors is an integer number (14364285901).

Almost surely, 2^28728571801 is an apocalyptic number.

It is an amenable number.

28728571801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728571801 is an equidigital number, since it uses as much as digits as its factorization.

28728571801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 501760, while the sum is 49.

The spelling of 28728571801 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred seventy-one thousand, eight hundred one".