28427233 has 2 divisors, whose sum is σ = 28427234. Its totient is φ = 28427232.

The previous prime is 28427219. The next prime is 28427237. The reversal of 28427233 is 33272482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 7524049 = 4572^2 + 2743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28427233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28427195 and 28427204.

It is not a weakly prime, because it can be changed into another prime (28427237) 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, 14213616 + 14213617.

It is an arithmetic number, because the mean of its divisors is an integer number (14213617).

Almost surely, 2^28427233 is an apocalyptic number.

It is an amenable number.

28427233 is a deficient number, since it is larger than the sum of its proper divisors (1).

28427233 is an equidigital number, since it uses as much as digits as its factorization.

28427233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 28427233 is about 5331.7195162536. The cubic root of 28427233 is about 305.1955495951.

The spelling of 28427233 in words is "twenty-eight million, four hundred twenty-seven thousand, two hundred thirty-three".