28055779 has 2 divisors, whose sum is σ = 28055780. Its totient is φ = 28055778.

The previous prime is 28055777. The next prime is 28055801. The reversal of 28055779 is 97755082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28055779 - 2¹ = 28055777 is a prime.

Together with 28055777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28055773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027889 + 14027890.

It is an arithmetic number, because the mean of its divisors is an integer number (14027890).

Almost surely, 2^28055779 is an apocalyptic number.

28055779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055779 is an equidigital number, since it uses as much as digits as its factorization.

28055779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 28055779 is about 5296.7706199155. The cubic root of 28055779 is about 303.8604037919.

The spelling of 28055779 in words is "twenty-eight million, fifty-five thousand, seven hundred seventy-nine".