28539675 has 24 divisors (see below), whose sum is σ = 52429680. Its totient is φ = 15220800.

The previous prime is 28539647. The next prime is 28539677. The reversal of 28539675 is 57693582.

It is a happy number.

It is not a de Polignac number, because 28539675 - 2⁷ = 28539547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28539675.

It is not an unprimeable number, because it can be changed into a prime (28539677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20466 + ... + 21815.

It is an arithmetic number, because the mean of its divisors is an integer number (2184570).

Almost surely, 2^28539675 is an apocalyptic number.

28539675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28539675 is a deficient number, since it is larger than the sum of its proper divisors (23890005).

28539675 is a wasteful number, since it uses less digits than its factorization.

28539675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42300 (or 42289 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 28539675 is about 5342.2537378900. The cubic root of 28539675 is about 305.5974136718.

The spelling of 28539675 in words is "twenty-eight million, five hundred thirty-nine thousand, six hundred seventy-five".