43697664 has 160 divisors (see below), whose sum is σ = 135036000. Its totient is φ = 13934592.

The previous prime is 43697651. The next prime is 43697669. The reversal of 43697664 is 46679634.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43697669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400842 + ... + 400950.

It is an arithmetic number, because the mean of its divisors is an integer number (843975).

Almost surely, 2^43697664 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 43697664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67518000).

43697664 is an abundant number, since it is smaller than the sum of its proper divisors (91338336).

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

43697664 is a wasteful number, since it uses less digits than its factorization.

43697664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 143 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 43697664 is about 6610.4208640600. The cubic root of 43697664 is about 352.2243748530.

The spelling of 43697664 in words is "forty-three million, six hundred ninety-seven thousand, six hundred sixty-four".