28858513 has 4 divisors (see below), whose sum is σ = 29123380. Its totient is φ = 28593648.

The previous prime is 28858507. The next prime is 28858523. The reversal of 28858513 is 31585882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31585882 = 2 ⋅15792941.

It can be written as a sum of positive squares in 2 ways, for example, as 18948609 + 9909904 = 4353^2 + 3148^2 .

It is a cyclic number.

It is not a de Polignac number, because 28858513 - 2⁵ = 28858481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28858523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132270 + ... + 132487.

It is an arithmetic number, because the mean of its divisors is an integer number (7280845).

Almost surely, 2^28858513 is an apocalyptic number.

It is an amenable number.

28858513 is a deficient number, since it is larger than the sum of its proper divisors (264867).

28858513 is a wasteful number, since it uses less digits than its factorization.

28858513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264866.

The product of its digits is 76800, while the sum is 40.

The square root of 28858513 is about 5372.0120066880. The cubic root of 28858513 is about 306.7312207885.

The spelling of 28858513 in words is "twenty-eight million, eight hundred fifty-eight thousand, five hundred thirteen".