43664768 has 32 divisors (see below), whose sum is σ = 99417360. Its totient is φ = 18713088.

The previous prime is 43664767. The next prime is 43664783. The reversal of 43664768 is 86746634.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×43664768² = 3813223928987648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23471 + ... + 25262.

Almost surely, 2^43664768 is an apocalyptic number.

It is an amenable number.

43664768 is an abundant number, since it is smaller than the sum of its proper divisors (55752592).

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

43664768 is an equidigital number, since it uses as much as digits as its factorization.

43664768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48754 (or 48742 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The square root of 43664768 is about 6607.9322030420. The cubic root of 43664768 is about 352.1359667572.

The spelling of 43664768 in words is "forty-three million, six hundred sixty-four thousand, seven hundred sixty-eight".