641700520 has 64 divisors (see below), whose sum is σ = 1480550400. Its totient is φ = 250225920.

The previous prime is 641700517. The next prime is 641700533. The reversal of 641700520 is 25007146.

641700520 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 15 ways as a sum of consecutive naturals, for example, 298650 + ... + 300790.

It is an arithmetic number, because the mean of its divisors is an integer number (23133600).

Almost surely, 2^641700520 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 641700520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740275200).

641700520 is an abundant number, since it is smaller than the sum of its proper divisors (838849880).

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

641700520 is a wasteful number, since it uses less digits than its factorization.

641700520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 641700520 is about 25331.8084628792. The cubic root of 641700520 is about 862.5364633468.

Adding to 641700520 its reverse (25007146), we get a palindrome (666707666).

The spelling of 641700520 in words is "six hundred forty-one million, seven hundred thousand, five hundred twenty".