641885980 has 12 divisors (see below), whose sum is σ = 1347960600. Its totient is φ = 256754384.

The previous prime is 641885977. The next prime is 641885989. The reversal of 641885980 is 89588146.

It is a super-2 number, since 2×641885980² = 824035222641120800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641885989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16047130 + ... + 16047169.

It is an arithmetic number, because the mean of its divisors is an integer number (112330050).

Almost surely, 2^641885980 is an apocalyptic number.

It is an amenable number.

641885980 is an abundant number, since it is smaller than the sum of its proper divisors (706074620).

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

641885980 is a wasteful number, since it uses less digits than its factorization.

641885980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32094308 (or 32094306 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 641885980 is about 25335.4688135033. The cubic root of 641885980 is about 862.6195501862.

The spelling of 641885980 in words is "six hundred forty-one million, eight hundred eighty-five thousand, nine hundred eighty".