640503430340 has 48 divisors (see below), whose sum is σ = 1428839227200. Its totient is φ = 240490311552.

The previous prime is 640503430337. The next prime is 640503430393. The reversal of 640503430340 is 43034305046.

It is a junction number, because it is equal to n+sod(n) for n = 640503430297 and 640503430306.

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, 7690394 + ... + 7773233.

It is an arithmetic number, because the mean of its divisors is an integer number (29767483900).

Almost surely, 2^640503430340 is an apocalyptic number.

It is an amenable number.

640503430340 is an abundant number, since it is smaller than the sum of its proper divisors (788335796860).

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

640503430340 is a wasteful number, since it uses less digits than its factorization.

640503430340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15463764 (or 15463762 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 32.

Adding to 640503430340 its reverse (43034305046), we get a palindrome (683537735386).

The spelling of 640503430340 in words is "six hundred forty billion, five hundred three million, four hundred thirty thousand, three hundred forty".