641868 has 24 divisors (see below), whose sum is σ = 1517040. Its totient is φ = 211200.

The previous prime is 641867. The next prime is 641873. The reversal of 641868 is 868146.

641868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×641868³ = 793338313836972096, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (641863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (63210).

2⁶⁴¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

641868 is an abundant number, since it is smaller than the sum of its proper divisors (875172).

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

641868 is a wasteful number, since it uses less digits than its factorization.

641868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 695 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 641868 is about 801.1666493308. The cubic root of 641868 is about 86.2611495773.

The spelling of 641868 in words is "six hundred forty-one thousand, eight hundred sixty-eight".