640837050620 has 96 divisors (see below), whose sum is σ = 1480025230656. Its totient is φ = 231633561600.

The previous prime is 640837050587. The next prime is 640837050709. The reversal of 640837050620 is 26050738046.

It is a happy number.

It is a congruent number.

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, 3250712 + ... + 3442208.

It is an arithmetic number, because the mean of its divisors is an integer number (15416929486).

Almost surely, 2^640837050620 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 640837050620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740012615328).

640837050620 is an abundant number, since it is smaller than the sum of its proper divisors (839188180036).

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

640837050620 is a wasteful number, since it uses less digits than its factorization.

640837050620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191791 (or 191789 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

Adding to 640837050620 its reverse (26050738046), we get a palindrome (666887788666).

The spelling of 640837050620 in words is "six hundred forty billion, eight hundred thirty-seven million, fifty thousand, six hundred twenty".