28539447 has 8 divisors (see below), whose sum is σ = 40291056. Its totient is φ = 17907072.

The previous prime is 28539431. The next prime is 28539449. The reversal of 28539447 is 74493582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28539447 - 2⁴ = 28539431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28539399 and 28539408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28539449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279748 + ... + 279849.

It is an arithmetic number, because the mean of its divisors is an integer number (5036382).

Almost surely, 2^28539447 is an apocalyptic number.

28539447 is a deficient number, since it is larger than the sum of its proper divisors (11751609).

28539447 is a wasteful number, since it uses less digits than its factorization.

28539447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559617.

The product of its digits is 241920, while the sum is 42.

The square root of 28539447 is about 5342.2323985390. The cubic root of 28539447 is about 305.5965998761.

The spelling of 28539447 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred forty-seven".