641444 has 12 divisors (see below), whose sum is σ = 1188684. Its totient is φ = 301824.

The previous prime is 641441. The next prime is 641453. The reversal of 641444 is 444146.

641444 = T₁₇₇ + T₁₇₈ + ... + T₂₁₀.

It can be written as a sum of positive squares in 2 ways, for example, as 473344 + 168100 = 688^2 + 410^2 .

It is a super-2 number, since 2×641444² = 822900810272, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (641441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4649 + ... + 4784.

It is an arithmetic number, because the mean of its divisors is an integer number (99057).

2⁶⁴¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

641444 is a deficient number, since it is larger than the sum of its proper divisors (547240).

641444 is a wasteful number, since it uses less digits than its factorization.

641444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9454 (or 9452 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 641444 is about 800.9019915071. The cubic root of 641444 is about 86.2421514947.

It can be divided in two parts, 64 and 1444, that multiplied together give a square (92416 = 304²).

The spelling of 641444 in words is "six hundred forty-one thousand, four hundred forty-four".