28305983 has 2 divisors, whose sum is σ = 28305984. Its totient is φ = 28305982.

The previous prime is 28305971. The next prime is 28306039. The reversal of 28305983 is 38950382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28305983 - 2¹⁰ = 28304959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28305913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152991 + 14152992.

It is an arithmetic number, because the mean of its divisors is an integer number (14152992).

Almost surely, 2^28305983 is an apocalyptic number.

28305983 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305983 is an equidigital number, since it uses as much as digits as its factorization.

28305983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 28305983 is about 5320.3367374631. The cubic root of 28305983 is about 304.7610167706.

The spelling of 28305983 in words is "twenty-eight million, three hundred five thousand, nine hundred eighty-three".