643224 has 16 divisors (see below), whose sum is σ = 1608120. Its totient is φ = 214400.

The previous prime is 643217. The next prime is 643231. The reversal of 643224 is 422346.

643224 = T₃₉₇ + T₃₉₈ + ... + T₄₀₄.

It is an interprime number because it is at equal distance from previous prime (643217) and next prime (643231).

It is a super-2 number, since 2×643224² = 827474228352, 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 643224.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643224.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13377 + ... + 13424.

2⁶⁴³²²⁴ is an apocalyptic number.

It is an amenable number.

643224 is an abundant number, since it is smaller than the sum of its proper divisors (964896).

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

643224 is a wasteful number, since it uses less digits than its factorization.

643224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26810 (or 26806 counting only the distinct ones).

The product of its digits is 1152, while the sum is 21.

The square root of 643224 is about 802.0124687310. The cubic root of 643224 is about 86.3218514899.

The spelling of 643224 in words is "six hundred forty-three thousand, two hundred twenty-four".