28243837 has 2 divisors, whose sum is σ = 28243838. Its totient is φ = 28243836.

The previous prime is 28243811. The next prime is 28243849. The reversal of 28243837 is 73834282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 586756 = 5259^2 + 766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28243837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28243796 and 28243805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28243867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121918 + 14121919.

It is an arithmetic number, because the mean of its divisors is an integer number (14121919).

Almost surely, 2^28243837 is an apocalyptic number.

It is an amenable number.

28243837 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243837 is an equidigital number, since it uses as much as digits as its factorization.

28243837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 37.

The square root of 28243837 is about 5314.4931084723. The cubic root of 28243837 is about 304.5378183063.

The spelling of 28243837 in words is "twenty-eight million, two hundred forty-three thousand, eight hundred thirty-seven".