28229237 has 2 divisors, whose sum is σ = 28229238. Its totient is φ = 28229236.

The previous prime is 28229233. The next prime is 28229249. The reversal of 28229237 is 73292282.

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., 25542916 + 2686321 = 5054^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 28229237 - 2² = 28229233 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28229197 and 28229206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28229233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114618 + 14114619.

It is an arithmetic number, because the mean of its divisors is an integer number (14114619).

Almost surely, 2^28229237 is an apocalyptic number.

It is an amenable number.

28229237 is a deficient number, since it is larger than the sum of its proper divisors (1).

28229237 is an equidigital number, since it uses as much as digits as its factorization.

28229237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 28229237 is about 5313.1193286054. The cubic root of 28229237 is about 304.4853346618.

The spelling of 28229237 in words is "twenty-eight million, two hundred twenty-nine thousand, two hundred thirty-seven".