40644643072 has 36 divisors (see below), whose sum is σ = 88506025776. Its totient is φ = 18474836480.

The previous prime is 40644643049. The next prime is 40644643111. The reversal of 40644643072 is 27034644604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7213918 + ... + 7219549.

It is an arithmetic number, because the mean of its divisors is an integer number (2458500716).

Almost surely, 2^40644643072 is an apocalyptic number.

It is an amenable number.

40644643072 is an abundant number, since it is smaller than the sum of its proper divisors (47861382704).

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

40644643072 is a wasteful number, since it uses less digits than its factorization.

40644643072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14433494 (or 14433480 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 40.

The spelling of 40644643072 in words is "forty billion, six hundred forty-four million, six hundred forty-three thousand, seventy-two".