28449847 has 4 divisors (see below), whose sum is σ = 29367616. Its totient is φ = 27532080.

The previous prime is 28449833. The next prime is 28449871. The reversal of 28449847 is 74894482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28449847 - 2⁷ = 28449719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28449797 and 28449806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449887) 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 in 3 ways as a sum of consecutive naturals, for example, 458838 + ... + 458899.

It is an arithmetic number, because the mean of its divisors is an integer number (7341904).

Almost surely, 2^28449847 is an apocalyptic number.

28449847 is a deficient number, since it is larger than the sum of its proper divisors (917769).

28449847 is an equidigital number, since it uses as much as digits as its factorization.

28449847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917768.

The product of its digits is 516096, while the sum is 46.

The square root of 28449847 is about 5333.8397988691. The cubic root of 28449847 is about 305.2764563188.

The spelling of 28449847 in words is "twenty-eight million, four hundred forty-nine thousand, eight hundred forty-seven".