43728644 has 12 divisors (see below), whose sum is σ = 76715100. Its totient is φ = 21810048.

The previous prime is 43728623. The next prime is 43728647. The reversal of 43728644 is 44682734.

43728644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 34668544 + 9060100 = 5888^2 + 3010^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43728598 and 43728607.

It is not an unprimeable number, because it can be changed into a prime (43728647) by changing a digit.

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, 11729 + ... + 15000.

It is an arithmetic number, because the mean of its divisors is an integer number (6392925).

Almost surely, 2^43728644 is an apocalyptic number.

It is an amenable number.

43728644 is a deficient number, since it is larger than the sum of its proper divisors (32986456).

43728644 is a wasteful number, since it uses less digits than its factorization.

43728644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27142 (or 27140 counting only the distinct ones).

The product of its digits is 129024, while the sum is 38.

The square root of 43728644 is about 6612.7637187488. The cubic root of 43728644 is about 352.3075931339.

The spelling of 43728644 in words is "forty-three million, seven hundred twenty-eight thousand, six hundred forty-four".