28785694429 has 2 divisors, whose sum is σ = 28785694430. Its totient is φ = 28785694428.

The previous prime is 28785694423. The next prime is 28785694451. The reversal of 28785694429 is 92449658782.

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., 28708219225 + 77475204 = 169435^2 + 8802^2 .

It is a cyclic number.

It is not a de Polignac number, because 28785694429 - 2¹¹ = 28785692381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28785694423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392847214 + 14392847215.

It is an arithmetic number, because the mean of its divisors is an integer number (14392847215).

Almost surely, 2^28785694429 is an apocalyptic number.

It is an amenable number.

28785694429 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785694429 is an equidigital number, since it uses as much as digits as its factorization.

28785694429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 64.

The spelling of 28785694429 in words is "twenty-eight billion, seven hundred eighty-five million, six hundred ninety-four thousand, four hundred twenty-nine".