43664868 has 54 divisors (see below), whose sum is σ = 119535234. Its totient is φ = 13433472.

The previous prime is 43664867. The next prime is 43664903. The reversal of 43664868 is 86846634.

It can be written as a sum of positive squares in 3 ways, for example, as 2985984 + 40678884 = 1728^2 + 6378^2 .

It is not an unprimeable number, because it can be changed into a prime (43664867) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2496 + ... + 9672.

Almost surely, 2^43664868 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 43664868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59767617).

43664868 is an abundant number, since it is smaller than the sum of its proper divisors (75870366).

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

43664868 is a wasteful number, since it uses less digits than its factorization.

43664868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213 (or 7195 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 43664868 is about 6607.9397697013. The cubic root of 43664868 is about 352.1362355748.

The spelling of 43664868 in words is "forty-three million, six hundred sixty-four thousand, eight hundred sixty-eight".