28297940729 has 2 divisors, whose sum is σ = 28297940730. Its totient is φ = 28297940728.

The previous prime is 28297940651. The next prime is 28297940743. The reversal of 28297940729 is 92704979282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23078167225 + 5219773504 = 151915^2 + 72248^2 .

It is a cyclic number.

It is not a de Polignac number, because 28297940729 - 2²⁴ = 28281163513 is a prime.

It is not a weakly prime, because it can be changed into another prime (28297940329) 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, 14148970364 + 14148970365.

It is an arithmetic number, because the mean of its divisors is an integer number (14148970365).

Almost surely, 2^28297940729 is an apocalyptic number.

It is an amenable number.

28297940729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28297940729 is an equidigital number, since it uses as much as digits as its factorization.

28297940729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 28297940729 in words is "twenty-eight billion, two hundred ninety-seven million, nine hundred forty thousand, seven hundred twenty-nine".