28680779 has 2 divisors, whose sum is σ = 28680780. Its totient is φ = 28680778.

The previous prime is 28680761. The next prime is 28680781. The reversal of 28680779 is 97708682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28680779 - 2²⁰ = 27632203 is a prime.

It is a Sophie Germain prime.

Together with 28680781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28680749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14340389 + 14340390.

It is an arithmetic number, because the mean of its divisors is an integer number (14340390).

Almost surely, 2^28680779 is an apocalyptic number.

28680779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28680779 is an equidigital number, since it uses as much as digits as its factorization.

28680779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 28680779 is about 5355.4438658248. The cubic root of 28680779 is about 306.1002241936.

The spelling of 28680779 in words is "twenty-eight million, six hundred eighty thousand, seven hundred seventy-nine".