28317473 has 4 divisors (see below), whose sum is σ = 28425408. Its totient is φ = 28209540.

The previous prime is 28317413. The next prime is 28317491. The reversal of 28317473 is 37471382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28317473 - 2⁶ = 28317409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28317403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53573 + ... + 54098.

It is an arithmetic number, because the mean of its divisors is an integer number (7106352).

Almost surely, 2^28317473 is an apocalyptic number.

It is an amenable number.

28317473 is a deficient number, since it is larger than the sum of its proper divisors (107935).

28317473 is a wasteful number, since it uses less digits than its factorization.

28317473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107934.

The product of its digits is 28224, while the sum is 35.

The square root of 28317473 is about 5321.4164467743. The cubic root of 28317473 is about 304.8022475166.

The spelling of 28317473 in words is "twenty-eight million, three hundred seventeen thousand, four hundred seventy-three".