28394789 has 2 divisors, whose sum is σ = 28394790. Its totient is φ = 28394788.

The previous prime is 28394767. The next prime is 28394819. The reversal of 28394789 is 98749382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27646564 + 748225 = 5258^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 28394789 - 2¹⁶ = 28329253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28394089) 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, 14197394 + 14197395.

It is an arithmetic number, because the mean of its divisors is an integer number (14197395).

Almost surely, 2^28394789 is an apocalyptic number.

It is an amenable number.

28394789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28394789 is an equidigital number, since it uses as much as digits as its factorization.

28394789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 28394789 is about 5328.6761019976. The cubic root of 28394789 is about 305.0793988397.

The spelling of 28394789 in words is "twenty-eight million, three hundred ninety-four thousand, seven hundred eighty-nine".