28728745841 has 2 divisors, whose sum is σ = 28728745842. Its totient is φ = 28728745840.

The previous prime is 28728745783. The next prime is 28728745933. The reversal of 28728745841 is 14854782782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27808897600 + 919848241 = 166760^2 + 30329^2 .

It is a cyclic number.

It is not a de Polignac number, because 28728745841 - 2⁶ = 28728745777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28728745741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364372920 + 14364372921.

It is an arithmetic number, because the mean of its divisors is an integer number (14364372921).

Almost surely, 2^28728745841 is an apocalyptic number.

It is an amenable number.

28728745841 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728745841 is an equidigital number, since it uses as much as digits as its factorization.

28728745841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8028160, while the sum is 56.

The spelling of 28728745841 in words is "twenty-eight billion, seven hundred twenty-eight million, seven hundred forty-five thousand, eight hundred forty-one".