640105202320 has 80 divisors (see below), whose sum is σ = 1490584596480. Its totient is φ = 255639900672.

The previous prime is 640105202267. The next prime is 640105202357. The reversal of 640105202320 is 23202501046.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237690894 + ... + 237693586.

It is an arithmetic number, because the mean of its divisors is an integer number (18632307456).

Almost surely, 2^640105202320 is an apocalyptic number.

It is an amenable number.

640105202320 is an abundant number, since it is smaller than the sum of its proper divisors (850479394160).

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

640105202320 is a wasteful number, since it uses less digits than its factorization.

640105202320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272 (or 6266 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 640105202320 its reverse (23202501046), we get a palindrome (663307703366).

The spelling of 640105202320 in words is "six hundred forty billion, one hundred five million, two hundred two thousand, three hundred twenty".