641224 has 8 divisors (see below), whose sum is σ = 1202310. Its totient is φ = 320608.

The previous prime is 641213. The next prime is 641227. The reversal of 641224 is 422146.

It can be written as a sum of positive squares in only one way, i.e., 338724 + 302500 = 582^2 + 550^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×641224² = 822336436352, which contains 22 as substring.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (641227) by changing a digit.

641224 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 as a sum of consecutive naturals, namely, 40069 + ... + 40084.

2⁶⁴¹²²⁴ is an apocalyptic number.

It is an amenable number.

641224 is a deficient number, since it is larger than the sum of its proper divisors (561086).

641224 is a wasteful number, since it uses less digits than its factorization.

641224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80159 (or 80155 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 641224 is about 800.7646345837. The cubic root of 641224 is about 86.2322907000.

The spelling of 641224 in words is "six hundred forty-one thousand, two hundred twenty-four".