641244 has 12 divisors (see below), whose sum is σ = 1496264. Its totient is φ = 213744.

The previous prime is 641239. The next prime is 641261. The reversal of 641244 is 442146.

641244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×641244² = 822387735072, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 641244.

It is a congruent number.

It is an unprimeable number.

641244 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26707 + ... + 26730.

2⁶⁴¹²⁴⁴ is an apocalyptic number.

It is an amenable number.

641244 is an abundant number, since it is smaller than the sum of its proper divisors (855020).

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

641244 is a wasteful number, since it uses less digits than its factorization.

641244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53444 (or 53442 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 641244 is about 800.7771225503. Note that the first 3 decimals coincide. The cubic root of 641244 is about 86.2331872291.

The spelling of 641244 in words is "six hundred forty-one thousand, two hundred forty-four".