641441520720 has 2880 divisors, whose sum is σ = 3244260854016. Its totient is φ = 115378421760.

The previous prime is 641441520691. The next prime is 641441520823. The reversal of 641441520720 is 27025144146.

641441520720 is a `hidden beast` number, since 6 + 4 + 1 + 441 + 5 + 207 + 2 + 0 = 666.

It is a super-2 number, since 2×641441520720² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 2315673222 + ... + 2315673498.

Almost surely, 2^641441520720 is an apocalyptic number.

641441520720 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 641441520720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1622130427008).

641441520720 is an abundant number, since it is smaller than the sum of its proper divisors (2602819333296).

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

641441520720 is a wasteful number, since it uses less digits than its factorization.

641441520720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

Adding to 641441520720 its reverse (27025144146), we get a palindrome (668466664866).

The spelling of 641441520720 in words is "six hundred forty-one billion, four hundred forty-one million, five hundred twenty thousand, seven hundred twenty".