643228 has 6 divisors (see below), whose sum is σ = 1125656. Its totient is φ = 321612.

The previous prime is 643217. The next prime is 643231. The reversal of 643228 is 822346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80400 + ... + 80407.

2⁶⁴³²²⁸ is an apocalyptic number.

It is an amenable number.

643228 is a deficient number, since it is larger than the sum of its proper divisors (482428).

643228 is a wasteful number, since it uses less digits than its factorization.

643228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160811 (or 160809 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 643228 is about 802.0149624539. The cubic root of 643228 is about 86.3220304253.

It can be divided in two parts, 6 and 43228, that added together give a palindrome (43234).

The spelling of 643228 in words is "six hundred forty-three thousand, two hundred twenty-eight".