641104 has 20 divisors (see below), whose sum is σ = 1315764. Its totient is φ = 301568.

The previous prime is 641101. The next prime is 641129. The reversal of 641104 is 401146.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 304704 + 336400 = 552^2 + 580^2 .

It is a super-2 number, since 2×641104² = 822028677632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 907 + ... + 1450.

2⁶⁴¹¹⁰⁴ is an apocalyptic number.

It is an amenable number.

641104 is an abundant number, since it is smaller than the sum of its proper divisors (674660).

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

641104 is a wasteful number, since it uses less digits than its factorization.

641104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2376 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 641104 is about 800.6897026939. The cubic root of 641104 is about 86.2269111340.

The spelling of 641104 in words is "six hundred forty-one thousand, one hundred four".