641890218 has 32 divisors (see below), whose sum is σ = 1303755264. Its totient is φ = 210659312.

The previous prime is 641890201. The next prime is 641890253. The reversal of 641890218 is 812098146.

641890218 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, 104221 + ... + 110207.

It is an arithmetic number, because the mean of its divisors is an integer number (40742352).

Almost surely, 2^641890218 is an apocalyptic number.

641890218 is an abundant number, since it is smaller than the sum of its proper divisors (661865046).

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

641890218 is a wasteful number, since it uses less digits than its factorization.

641890218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6266.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 641890218 is about 25335.5524510519. The cubic root of 641890218 is about 862.6214486405.

The spelling of 641890218 in words is "six hundred forty-one million, eight hundred ninety thousand, two hundred eighteen".