28709042897 has 2 divisors, whose sum is σ = 28709042898. Its totient is φ = 28709042896.

The previous prime is 28709042891. The next prime is 28709042933. The reversal of 28709042897 is 79824090782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23694137041 + 5014905856 = 153929^2 + 70816^2 .

It is a cyclic number.

It is not a de Polignac number, because 28709042897 - 2⁸ = 28709042641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28709042891) 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, 14354521448 + 14354521449.

It is an arithmetic number, because the mean of its divisors is an integer number (14354521449).

Almost surely, 2^28709042897 is an apocalyptic number.

It is an amenable number.

28709042897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28709042897 is an equidigital number, since it uses as much as digits as its factorization.

28709042897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 28709042897 in words is "twenty-eight billion, seven hundred nine million, forty-two thousand, eight hundred ninety-seven".