28785979 has 2 divisors, whose sum is σ = 28785980. Its totient is φ = 28785978.

The previous prime is 28785929. The next prime is 28785983. The reversal of 28785979 is 97958782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28785979 - 2⁷ = 28785851 is a prime.

It is not a weakly prime, because it can be changed into another prime (28785929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392989 + 14392990.

It is an arithmetic number, because the mean of its divisors is an integer number (14392990).

Almost surely, 2^28785979 is an apocalyptic number.

28785979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785979 is an equidigital number, since it uses as much as digits as its factorization.

28785979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The square root of 28785979 is about 5365.2566574210. The cubic root of 28785979 is about 306.4740221767.

The spelling of 28785979 in words is "twenty-eight million, seven hundred eighty-five thousand, nine hundred seventy-nine".