640350144440 has 32 divisors (see below), whose sum is σ = 1455053060160. Its totient is φ = 253604016000.

The previous prime is 640350144433. The next prime is 640350144443. The reversal of 640350144440 is 44441053046.

It is a self number, because there is not a number n which added to its sum of digits gives 640350144440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640350144443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79247216 + ... + 79255295.

It is an arithmetic number, because the mean of its divisors is an integer number (45470408130).

Almost surely, 2^640350144440 is an apocalyptic number.

It is an amenable number.

640350144440 is an abundant number, since it is smaller than the sum of its proper divisors (814702915720).

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

640350144440 is a wasteful number, since it uses less digits than its factorization.

640350144440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158502623 (or 158502619 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 640350144440 its reverse (44441053046), we get a palindrome (684791197486).

The spelling of 640350144440 in words is "six hundred forty billion, three hundred fifty million, one hundred forty-four thousand, four hundred forty".