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643204 = 224012
BaseRepresentation
bin10011101000010000100
31012200022101
42131002010
5131040304
621441444
75316142
oct2350204
91180271
10643204
113aa281
12270284
131969c3
1412a592
15ca8a4
hex9d084

643204 has 9 divisors (see below), whose sum is σ = 1128421. Its totient is φ = 320800.

The previous prime is 643199. The next prime is 643213. The reversal of 643204 is 402346.

The square root of 643204 is 802.

It is a perfect power (a square), and thus also a powerful number.

643204 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 6400 = 798^2 + 80^2 .

It is a super-2 number, since 2×6432042 = 827422771232, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 1404 + ... + 1804.

2643204 is an apocalyptic number.

643204 is the 802-nd square number.

It is an amenable number.

643204 is a deficient number, since it is larger than the sum of its proper divisors (485217).

643204 is an equidigital number, since it uses as much as digits as its factorization.

643204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The cubic root of 643204 is about 86.3209568016.

Multiplying 643204 by its product of nonzero digits (576), we get a square (370485504 = 192482).

The spelling of 643204 in words is "six hundred forty-three thousand, two hundred four".

Divisors: 1 2 4 401 802 1604 160801 321602 643204