28658233 has 2 divisors, whose sum is σ = 28658234. Its totient is φ = 28658232.

The previous prime is 28658219. The next prime is 28658237. The reversal of 28658233 is 33285682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 9753129 = 4348^2 + 3123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28658233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28658192 and 28658201.

It is not a weakly prime, because it can be changed into another prime (28658237) 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, 14329116 + 14329117.

It is an arithmetic number, because the mean of its divisors is an integer number (14329117).

Almost surely, 2^28658233 is an apocalyptic number.

It is an amenable number.

28658233 is a deficient number, since it is larger than the sum of its proper divisors (1).

28658233 is an equidigital number, since it uses as much as digits as its factorization.

28658233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 37.

The square root of 28658233 is about 5353.3384910727. The cubic root of 28658233 is about 306.0199945640.

The spelling of 28658233 in words is "twenty-eight million, six hundred fifty-eight thousand, two hundred thirty-three".