28897796729 has 2 divisors, whose sum is σ = 28897796730. Its totient is φ = 28897796728.

The previous prime is 28897796723. The next prime is 28897796743. The reversal of 28897796729 is 92769779882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15116210704 + 13781586025 = 122948^2 + 117395^2 .

It is a cyclic number.

It is not a de Polignac number, because 28897796729 - 2¹⁶ = 28897731193 is a prime.

It is not a weakly prime, because it can be changed into another prime (28897796723) 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, 14448898364 + 14448898365.

It is an arithmetic number, because the mean of its divisors is an integer number (14448898365).

Almost surely, 2^28897796729 is an apocalyptic number.

It is an amenable number.

28897796729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897796729 is an equidigital number, since it uses as much as digits as its factorization.

28897796729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384072192, while the sum is 74.

The spelling of 28897796729 in words is "twenty-eight billion, eight hundred ninety-seven million, seven hundred ninety-six thousand, seven hundred twenty-nine".