28539986 has 16 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 14026848.

The previous prime is 28539967. The next prime is 28539989. The reversal of 28539986 is 68993582.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28539989) 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, 39335 + ... + 40053.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^28539986 is an apocalyptic number.

28539986 is a deficient number, since it is larger than the sum of its proper divisors (15005614).

28539986 is a wasteful number, since it uses less digits than its factorization.

28539986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its digits is 933120, while the sum is 50.

The square root of 28539986 is about 5342.2828453761. The cubic root of 28539986 is about 305.5985237107.

The spelling of 28539986 in words is "twenty-eight million, five hundred thirty-nine thousand, nine hundred eighty-six".