28539513 has 8 divisors (see below), whose sum is σ = 42280800. Its totient is φ = 19026324.

The previous prime is 28539503. The next prime is 28539523. The reversal of 28539513 is 31593582.

It is an interprime number because it is at equal distance from previous prime (28539503) and next prime (28539523).

It is not a de Polignac number, because 28539513 - 2⁶ = 28539449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28539503) 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, 528483 + ... + 528536.

It is an arithmetic number, because the mean of its divisors is an integer number (5285100).

Almost surely, 2^28539513 is an apocalyptic number.

It is an amenable number.

28539513 is a deficient number, since it is larger than the sum of its proper divisors (13741287).

28539513 is a wasteful number, since it uses less digits than its factorization.

28539513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057028 (or 1057022 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 28539513 is about 5342.2385757283. The cubic root of 28539513 is about 305.5968354489.

The spelling of 28539513 in words is "twenty-eight million, five hundred thirty-nine thousand, five hundred thirteen".