28445939 has 2 divisors, whose sum is σ = 28445940. Its totient is φ = 28445938.

The previous prime is 28445899. The next prime is 28445957. The reversal of 28445939 is 93954482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28445939 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28445939.

It is not a weakly prime, because it can be changed into another prime (28445969) 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, 14222969 + 14222970.

It is an arithmetic number, because the mean of its divisors is an integer number (14222970).

Almost surely, 2^28445939 is an apocalyptic number.

28445939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445939 is an equidigital number, since it uses as much as digits as its factorization.

28445939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 28445939 is about 5333.4734460762. The cubic root of 28445939 is about 305.2624776259.

The spelling of 28445939 in words is "twenty-eight million, four hundred forty-five thousand, nine hundred thirty-nine".