641712840 has 128 divisors (see below), whose sum is σ = 2051481600. Its totient is φ = 160116480.

The previous prime is 641712791. The next prime is 641712871. The reversal of 641712840 is 48217146.

641712840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 187545 + ... + 190935.

It is an arithmetic number, because the mean of its divisors is an integer number (16027200).

Almost surely, 2^641712840 is an apocalyptic number.

641712840 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 641712840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025740800).

641712840 is an abundant number, since it is smaller than the sum of its proper divisors (1409768760).

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

641712840 is a wasteful number, since it uses less digits than its factorization.

641712840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507 (or 3503 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 641712840 is about 25332.0516342439. The cubic root of 641712840 is about 862.5419832536.

Adding to 641712840 its reverse (48217146), we get a palindrome (689929986).

The spelling of 641712840 in words is "six hundred forty-one million, seven hundred twelve thousand, eight hundred forty".