28238447 has 2 divisors, whose sum is σ = 28238448. Its totient is φ = 28238446.

The previous prime is 28238429. The next prime is 28238519. The reversal of 28238447 is 74483282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28238447 - 2¹⁰ = 28237423 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28238447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28238647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119223 + 14119224.

It is an arithmetic number, because the mean of its divisors is an integer number (14119224).

Almost surely, 2^28238447 is an apocalyptic number.

28238447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238447 is an equidigital number, since it uses as much as digits as its factorization.

28238447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 38.

The square root of 28238447 is about 5313.9859804106. The cubic root of 28238447 is about 304.5184446016.

The spelling of 28238447 in words is "twenty-eight million, two hundred thirty-eight thousand, four hundred forty-seven".