43664616 has 64 divisors (see below), whose sum is σ = 125222400. Its totient is φ = 14083200.

The previous prime is 43664611. The next prime is 43664617. The reversal of 43664616 is 61646634.

43664616 is a `hidden beast` number, since 4 + 3 + 6 + 646 + 1 + 6 = 666.

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 not an unprimeable number, because it can be changed into a prime (43664611) by changing a digit.

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, 3436 + ... + 9956.

It is an arithmetic number, because the mean of its divisors is an integer number (1956600).

Almost surely, 2^43664616 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 43664616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62611200).

43664616 is an abundant number, since it is smaller than the sum of its proper divisors (81557784).

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

43664616 is a wasteful number, since it uses less digits than its factorization.

43664616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567 (or 6557 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 43664616 is about 6607.9207017034. The cubic root of 43664616 is about 352.1355581537.

The spelling of 43664616 in words is "forty-three million, six hundred sixty-four thousand, six hundred sixteen".