28320979 has 2 divisors, whose sum is σ = 28320980. Its totient is φ = 28320978.

The previous prime is 28320953. The next prime is 28321061. The reversal of 28320979 is 97902382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28320979 is a prime.

It is not a weakly prime, because it can be changed into another prime (28323979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160489 + 14160490.

It is an arithmetic number, because the mean of its divisors is an integer number (14160490).

Almost surely, 2^28320979 is an apocalyptic number.

28320979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320979 is an equidigital number, since it uses as much as digits as its factorization.

28320979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 28320979 is about 5321.7458601478. The cubic root of 28320979 is about 304.8148262353.

The spelling of 28320979 in words is "twenty-eight million, three hundred twenty thousand, nine hundred seventy-nine".