43857664 has 36 divisors (see below), whose sum is σ = 88885384. Its totient is φ = 21593088.

The previous prime is 43857661. The next prime is 43857679. The reversal of 43857664 is 46675834.

It is a self number, because there is not a number n which added to its sum of digits gives 43857664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43857661) 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 3 ways as a sum of consecutive naturals, for example, 15874 + ... + 18430.

Almost surely, 2^43857664 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 43857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44442692).

43857664 is an abundant number, since it is smaller than the sum of its proper divisors (45027720).

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

43857664 is an equidigital number, since it uses as much as digits as its factorization.

43857664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 2626 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The square root of 43857664 is about 6622.5119101441. The cubic root of 43857664 is about 352.6537437757.

It can be divided in two parts, 43857 and 664, that added together give a square (44521 = 211²).

The spelling of 43857664 in words is "forty-three million, eight hundred fifty-seven thousand, six hundred sixty-four".