643282 has 8 divisors (see below), whose sum is σ = 991116. Its totient is φ = 312912.

The previous prime is 643273. The next prime is 643301. The reversal of 643282 is 282346.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 1681 = 801^2 + 41^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 4273 + ... + 4420.

2⁶⁴³²⁸² is an apocalyptic number.

643282 is a deficient number, since it is larger than the sum of its proper divisors (347834).

643282 is a wasteful number, since it uses less digits than its factorization.

643282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8732.

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

The square root of 643282 is about 802.0486269548. The cubic root of 643282 is about 86.3244459810.

The spelling of 643282 in words is "six hundred forty-three thousand, two hundred eighty-two".