641144 has 24 divisors (see below), whose sum is σ = 1386840. Its totient is φ = 272208.

The previous prime is 641143. The next prime is 641167. The reversal of 641144 is 441146.

641144 = T₄₆ + T₄₇ + ... + T₁₅₇.

It is a happy number.

It is a super-2 number, since 2×641144² = 822131257472, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641144.

It is not an unprimeable number, because it can be changed into a prime (641143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5939 + ... + 6045.

It is an arithmetic number, because the mean of its divisors is an integer number (57785).

2⁶⁴¹¹⁴⁴ 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 641144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693420).

641144 is an abundant number, since it is smaller than the sum of its proper divisors (745696).

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

641144 is a wasteful number, since it uses less digits than its factorization.

641144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 116 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 641144 is about 800.7146807696. The cubic root of 641144 is about 86.2287043973.

The spelling of 641144 in words is "six hundred forty-one thousand, one hundred forty-four".