28447847 has 2 divisors, whose sum is σ = 28447848. Its totient is φ = 28447846.

The previous prime is 28447841. The next prime is 28447889. The reversal of 28447847 is 74874482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28447847 - 2¹⁰ = 28446823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28447798 and 28447807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28447841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14223923 + 14223924.

It is an arithmetic number, because the mean of its divisors is an integer number (14223924).

Almost surely, 2^28447847 is an apocalyptic number.

28447847 is a deficient number, since it is larger than the sum of its proper divisors (1).

28447847 is an equidigital number, since it uses as much as digits as its factorization.

28447847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 401408, while the sum is 44.

The square root of 28447847 is about 5333.6523133778. The cubic root of 28447847 is about 305.2693025929.

The spelling of 28447847 in words is "twenty-eight million, four hundred forty-seven thousand, eight hundred forty-seven".