28821706729 has 2 divisors, whose sum is σ = 28821706730. Its totient is φ = 28821706728.

The previous prime is 28821706723. The next prime is 28821706759. The reversal of 28821706729 is 92760712882.

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., 26855671129 + 1966035600 = 163877^2 + 44340^2 .

It is a cyclic number.

It is not a de Polignac number, because 28821706729 - 2²⁵ = 28788152297 is a prime.

It is not a weakly prime, because it can be changed into another prime (28821706723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410853364 + 14410853365.

It is an arithmetic number, because the mean of its divisors is an integer number (14410853365).

Almost surely, 2^28821706729 is an apocalyptic number.

It is an amenable number.

28821706729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28821706729 is an equidigital number, since it uses as much as digits as its factorization.

28821706729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 28821706729 in words is "twenty-eight billion, eight hundred twenty-one million, seven hundred six thousand, seven hundred twenty-nine".