641500380 has 72 divisors (see below), whose sum is σ = 1955772000. Its totient is φ = 170197632.

The previous prime is 641500367. The next prime is 641500399. The reversal of 641500380 is 83005146.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26866 + ... + 44774.

It is an arithmetic number, because the mean of its divisors is an integer number (27163500).

Almost surely, 2^641500380 is an apocalyptic number.

641500380 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 641500380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977886000).

641500380 is an abundant number, since it is smaller than the sum of its proper divisors (1314271620).

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

641500380 is a wasteful number, since it uses less digits than its factorization.

641500380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18123 (or 18118 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 641500380 is about 25327.8577854504. The cubic root of 641500380 is about 862.4467818456.

The spelling of 641500380 in words is "six hundred forty-one million, five hundred thousand, three hundred eighty".