28473847 has 4 divisors (see below), whose sum is σ = 28495600. Its totient is φ = 28452096.

The previous prime is 28473833. The next prime is 28473889. The reversal of 28473847 is 74837482.

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 28473847 - 2²³ = 20085239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28473547) 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 in 3 ways as a sum of consecutive naturals, for example, 8778 + ... + 11575.

It is an arithmetic number, because the mean of its divisors is an integer number (7123900).

Almost surely, 2^28473847 is an apocalyptic number.

28473847 is a deficient number, since it is larger than the sum of its proper divisors (21753).

28473847 is a wasteful number, since it uses less digits than its factorization.

28473847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21752.

The product of its digits is 301056, while the sum is 43.

The square root of 28473847 is about 5336.0891109501. The cubic root of 28473847 is about 305.3622748903.

Subtracting 28473847 from its reverse (74837482), we obtain a triangular number (46363635 = T₉₆₂₉).

The spelling of 28473847 in words is "twenty-eight million, four hundred seventy-three thousand, eight hundred forty-seven".