641016880 has 80 divisors (see below), whose sum is σ = 1708462080. Its totient is φ = 219108096.

The previous prime is 641016839. The next prime is 641016913. The reversal of 641016880 is 88610146.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203961 + ... + 207079.

It is an arithmetic number, because the mean of its divisors is an integer number (21355776).

Almost surely, 2^641016880 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 641016880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (854231040).

641016880 is an abundant number, since it is smaller than the sum of its proper divisors (1067445200).

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

641016880 is a wasteful number, since it uses less digits than its factorization.

641016880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506 (or 3500 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 641016880 is about 25318.3111601070. The cubic root of 641016880 is about 862.2300514851.

The spelling of 641016880 in words is "six hundred forty-one million, sixteen thousand, eight hundred eighty".