40644263620 has 48 divisors (see below), whose sum is σ = 86394269808. Its totient is φ = 16060561920.

The previous prime is 40644263581. The next prime is 40644263633. The reversal of 40644263620 is 2636244604.

It can be written as a sum of positive squares in 8 ways, for example, as 56520324 + 40587743296 = 7518^2 + 201464^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40644263620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505810 + ... + 580630.

It is an arithmetic number, because the mean of its divisors is an integer number (1799880621).

Almost surely, 2^40644263620 is an apocalyptic number.

It is an amenable number.

40644263620 is an abundant number, since it is smaller than the sum of its proper divisors (45750006188).

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

40644263620 is a wasteful number, since it uses less digits than its factorization.

40644263620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75160 (or 75158 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

The spelling of 40644263620 in words is "forty billion, six hundred forty-four million, two hundred sixty-three thousand, six hundred twenty".