40644412842 has 64 divisors (see below), whose sum is σ = 90564894720. Its totient is φ = 12055617600.

The previous prime is 40644412841. The next prime is 40644412871. The reversal of 40644412842 is 24821444604.

It is a self number, because there is not a number n which added to its sum of digits gives 40644412842.

It is not an unprimeable number, because it can be changed into a prime (40644412841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1494159 + ... + 1521117.

It is an arithmetic number, because the mean of its divisors is an integer number (1415076480).

Almost surely, 2^40644412842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40644412842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45282447360).

40644412842 is an abundant number, since it is smaller than the sum of its proper divisors (49920481878).

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

40644412842 is a wasteful number, since it uses less digits than its factorization.

40644412842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27459.

The product of its (nonzero) digits is 196608, while the sum is 39.

The spelling of 40644412842 in words is "forty billion, six hundred forty-four million, four hundred twelve thousand, eight hundred forty-two".