640945350240 has 96 divisors (see below), whose sum is σ = 2174283863136. Its totient is φ = 157771161600.

The previous prime is 640945350127. The next prime is 640945350259. The reversal of 640945350240 is 42053549046.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 640945350192 and 640945350201.

It is a congruent number.

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, 51351561 + ... + 51364040.

It is an arithmetic number, because the mean of its divisors is an integer number (22648790241).

Almost surely, 2^640945350240 is an apocalyptic number.

640945350240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640945350240 is an abundant number, since it is smaller than the sum of its proper divisors (1533338512896).

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

640945350240 is a wasteful number, since it uses less digits than its factorization.

640945350240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102715632 (or 102715624 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 640945350240 its reverse (42053549046), we get a palindrome (682998899286).

The spelling of 640945350240 in words is "six hundred forty billion, nine hundred forty-five million, three hundred fifty thousand, two hundred forty".