641844 has 60 divisors (see below), whose sum is σ = 1924384. Its totient is φ = 182736.

The previous prime is 641843. The next prime is 641863. The reversal of 641844 is 448146.

641844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641843) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2127 + ... + 2409.

2⁶⁴¹⁸⁴⁴ 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 641844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962192).

641844 is an abundant number, since it is smaller than the sum of its proper divisors (1282540).

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

641844 is a wasteful number, since it uses less digits than its factorization.

641844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 295 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 641844 is about 801.1516710336. The cubic root of 641844 is about 86.2600744376.

It can be divided in two parts, 641 and 844, that added together give a triangular number (1485 = T₅₄).

The spelling of 641844 in words is "six hundred forty-one thousand, eight hundred forty-four".