643322 has 4 divisors (see below), whose sum is σ = 964986. Its totient is φ = 321660.

The previous prime is 643303. The next prime is 643369. The reversal of 643322 is 223346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 606841 + 36481 = 779^2 + 191^2 .

It is a d-powerful number, because it can be written as 6⁵ + 4⁶ + 3¹⁰ + 3¹² + 2¹³ + 2¹⁵ .

It is a nialpdrome in base 10 and base 15.

It is a junction number, because it is equal to n+sod(n) for n = 643294 and 643303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160829 + ... + 160832.

2⁶⁴³³²² is an apocalyptic number.

643322 is a deficient number, since it is larger than the sum of its proper divisors (321664).

643322 is a wasteful number, since it uses less digits than its factorization.

643322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321663.

The product of its digits is 864, while the sum is 20.

The square root of 643322 is about 802.0735627111. The cubic root of 643322 is about 86.3262351944.

Adding to 643322 its reverse (223346), we get a palindrome (866668).

It can be divided in two parts, 643 and 322, that multiplied together give a triangular number (207046 = T₆₄₃).

The spelling of 643322 in words is "six hundred forty-three thousand, three hundred twenty-two".