43664328 has 24 divisors (see below), whose sum is σ = 118257750. Its totient is φ = 14554752.

The previous prime is 43664311. The next prime is 43664351. The reversal of 43664328 is 82346634.

It is a happy number.

43664328 is a `hidden beast` number, since 4 + 3 + 6 + 643 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42536484 + 1127844 = 6522^2 + 1062^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 43664292 and 43664301.

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 5 ways as a sum of consecutive naturals, for example, 303153 + ... + 303296.

Almost surely, 2^43664328 is an apocalyptic number.

It is an amenable number.

43664328 is an abundant number, since it is smaller than the sum of its proper divisors (74593422).

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

43664328 is a wasteful number, since it uses less digits than its factorization.

43664328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606461 (or 606454 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 43664328 is about 6607.8989096384. The cubic root of 43664328 is about 352.1347839551.

The spelling of 43664328 in words is "forty-three million, six hundred sixty-four thousand, three hundred twenty-eight".