640312104240 has 160 divisors (see below), whose sum is σ = 2214308275200. Its totient is φ = 170069472000.

The previous prime is 640312104217. The next prime is 640312104241. The reversal of 640312104240 is 42401213046.

It is a happy number.

640312104240 is a `hidden beast` number, since 6 + 4 + 0 + 312 + 104 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (640312104241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48360 + ... + 1132679.

It is an arithmetic number, because the mean of its divisors is an integer number (13839426720).

Almost surely, 2^640312104240 is an apocalyptic number.

640312104240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640312104240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107154137600).

640312104240 is an abundant number, since it is smaller than the sum of its proper divisors (1573996170960).

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

640312104240 is a wasteful number, since it uses less digits than its factorization.

640312104240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181312 (or 1181300 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 640312104240 its reverse (42401213046), we get a palindrome (682713317286).

The spelling of 640312104240 in words is "six hundred forty billion, three hundred twelve million, one hundred four thousand, two hundred forty".