643243000 has 32 divisors (see below), whose sum is σ = 1505190960. Its totient is φ = 257296800.

The previous prime is 643242989. The next prime is 643243067. The reversal of 643243000 is 342346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320622 + ... + 322621.

Almost surely, 2^643243000 is an apocalyptic number.

It is an amenable number.

643243000 is an abundant number, since it is smaller than the sum of its proper divisors (861947960).

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

643243000 is a wasteful number, since it uses less digits than its factorization.

643243000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643264 (or 643250 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 643243000 is about 25362.2357058679. The cubic root of 643243000 is about 863.2270142657.

Adding to 643243000 its reverse (342346), we get a palindrome (643585346).

The spelling of 643243000 in words is "six hundred forty-three million, two hundred forty-three thousand".