28543915 has 4 divisors (see below), whose sum is σ = 34252704. Its totient is φ = 22835128.

The previous prime is 28543883. The next prime is 28543919. The reversal of 28543915 is 51934582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28543915 - 2⁵ = 28543883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28543919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2854387 + ... + 2854396.

It is an arithmetic number, because the mean of its divisors is an integer number (8563176).

Almost surely, 2^28543915 is an apocalyptic number.

28543915 is a deficient number, since it is larger than the sum of its proper divisors (5708789).

28543915 is an equidigital number, since it uses as much as digits as its factorization.

28543915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5708788.

The product of its digits is 43200, while the sum is 37.

The square root of 28543915 is about 5342.6505594134. The cubic root of 28543915 is about 305.6125466270.

The spelling of 28543915 in words is "twenty-eight million, five hundred forty-three thousand, nine hundred fifteen".