643024 has 10 divisors (see below), whose sum is σ = 1245890. Its totient is φ = 321504.

The previous prime is 643021. The next prime is 643031. The reversal of 643024 is 420346.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 283024 = 600^2 + 532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642992 and 643010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643021) by changing a digit.

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, 20079 + ... + 20110.

It is an arithmetic number, because the mean of its divisors is an integer number (124589).

2⁶⁴³⁰²⁴ is an apocalyptic number.

It is an amenable number.

643024 is a deficient number, since it is larger than the sum of its proper divisors (602866).

643024 is a wasteful number, since it uses less digits than its factorization.

643024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40197 (or 40191 counting only the distinct ones).

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

The square root of 643024 is about 801.8877726964. The cubic root of 643024 is about 86.3129037724.

The spelling of 643024 in words is "six hundred forty-three thousand, twenty-four".