28539473 has 4 divisors (see below), whose sum is σ = 28554240. Its totient is φ = 28524708.

The previous prime is 28539449. The next prime is 28539479. The reversal of 28539473 is 37493582.

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 28539473 - 2⁶ = 28539409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28539473.

It is not an unprimeable number, because it can be changed into a prime (28539479) 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, 3953 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (7138560).

Almost surely, 2^28539473 is an apocalyptic number.

It is an amenable number.

28539473 is a deficient number, since it is larger than the sum of its proper divisors (14767).

28539473 is a wasteful number, since it uses less digits than its factorization.

28539473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14766.

The product of its digits is 181440, while the sum is 41.

The square root of 28539473 is about 5342.2348319781. The cubic root of 28539473 is about 305.5966926775.

The spelling of 28539473 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred seventy-three".