43664819904 has 448 divisors, whose sum is σ = 139851993600. Its totient is φ = 13314502656.

The previous prime is 43664819857. The next prime is 43664819927. The reversal of 43664819904 is 40991846634.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 221648734 + ... + 221648930.

Almost surely, 2^43664819904 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 43664819904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69925996800).

43664819904 is an abundant number, since it is smaller than the sum of its proper divisors (96187173696).

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

43664819904 is a wasteful number, since it uses less digits than its factorization.

43664819904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 43664819904 in words is "forty-three billion, six hundred sixty-four million, eight hundred nineteen thousand, nine hundred four".