28438247 has 2 divisors, whose sum is σ = 28438248. Its totient is φ = 28438246.

The previous prime is 28438213. The next prime is 28438273. The reversal of 28438247 is 74283482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28438247 - 2¹⁴ = 28421863 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 28438247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28438547) 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, 14219123 + 14219124.

It is an arithmetic number, because the mean of its divisors is an integer number (14219124).

Almost surely, 2^28438247 is an apocalyptic number.

28438247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28438247 is an equidigital number, since it uses as much as digits as its factorization.

28438247 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28438247 is about 5332.7522912657. The cubic root of 28438247 is about 305.2349600406.

The spelling of 28438247 in words is "twenty-eight million, four hundred thirty-eight thousand, two hundred forty-seven".