28543613 has 16 divisors (see below), whose sum is σ = 33736704. Its totient is φ = 23639040.

The previous prime is 28543609. The next prime is 28543637. The reversal of 28543613 is 31634582.

It is a cyclic number.

It is not a de Polignac number, because 28543613 - 2² = 28543609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28543613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28543673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49181 + ... + 49757.

It is an arithmetic number, because the mean of its divisors is an integer number (2108544).

Almost surely, 2^28543613 is an apocalyptic number.

It is an amenable number.

28543613 is a deficient number, since it is larger than the sum of its proper divisors (5193091).

28543613 is a wasteful number, since it uses less digits than its factorization.

28543613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 17280, while the sum is 32.

The square root of 28543613 is about 5342.6222962137. The cubic root of 28543613 is about 305.6114688104.

The spelling of 28543613 in words is "twenty-eight million, five hundred forty-three thousand, six hundred thirteen".