43215728 has 20 divisors (see below), whose sum is σ = 88137960. Its totient is φ = 20470464.

The previous prime is 43215719. The next prime is 43215743. The reversal of 43215728 is 82751234.

43215728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 43215694 and 43215703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70775 + ... + 71382.

It is an arithmetic number, because the mean of its divisors is an integer number (4406898).

Almost surely, 2^43215728 is an apocalyptic number.

It is an amenable number.

43215728 is an abundant number, since it is smaller than the sum of its proper divisors (44922232).

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

43215728 is a wasteful number, since it uses less digits than its factorization.

43215728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142184 (or 142178 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 43215728 is about 6573.8670506788. The cubic root of 43215728 is about 350.9247057809.

The spelling of 43215728 in words is "forty-three million, two hundred fifteen thousand, seven hundred twenty-eight".