28543424 has 112 divisors (see below), whose sum is σ = 72542400. Its totient is φ = 10902528.

The previous prime is 28543399. The next prime is 28543439. The reversal of 28543424 is 42434582.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 984242 + ... + 984270.

It is an arithmetic number, because the mean of its divisors is an integer number (647700).

Almost surely, 2^28543424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28543424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36271200).

28543424 is an abundant number, since it is smaller than the sum of its proper divisors (43998976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28543424 is an equidigital number, since it uses as much as digits as its factorization.

28543424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 51 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 28543424 is about 5342.6046082412. The cubic root of 28543424 is about 305.6107942790.

The spelling of 28543424 in words is "twenty-eight million, five hundred forty-three thousand, four hundred twenty-four".