43218387644 has 12 divisors (see below), whose sum is σ = 75661185600. Its totient is φ = 21600906048.

The previous prime is 43218387631. The next prime is 43218387673. The reversal of 43218387644 is 44678381234.

It is a junction number, because it is equal to n+sod(n) for n = 43218387592 and 43218387601.

It is a congruent number.

It is an unprimeable number.

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, 2060204 + ... + 2081075.

It is an arithmetic number, because the mean of its divisors is an integer number (6305098800).

Almost surely, 2^43218387644 is an apocalyptic number.

It is an amenable number.

43218387644 is a deficient number, since it is larger than the sum of its proper divisors (32442797956).

43218387644 is a wasteful number, since it uses less digits than its factorization.

43218387644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143892 (or 4143890 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 50.

The spelling of 43218387644 in words is "forty-three billion, two hundred eighteen million, three hundred eighty-seven thousand, six hundred forty-four".