640510004240 has 160 divisors (see below), whose sum is σ = 1556420382720. Its totient is φ = 244854374400.

The previous prime is 640510004221. The next prime is 640510004261. The reversal of 640510004240 is 42400015046.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122442425 + ... + 122447655.

It is an arithmetic number, because the mean of its divisors is an integer number (9727627392).

Almost surely, 2^640510004240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640510004240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778210191360).

640510004240 is an abundant number, since it is smaller than the sum of its proper divisors (915910378480).

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

640510004240 is a wasteful number, since it uses less digits than its factorization.

640510004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881 (or 5875 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 640510004240 its reverse (42400015046), we get a palindrome (682910019286).

The spelling of 640510004240 in words is "six hundred forty billion, five hundred ten million, four thousand, two hundred forty".