643050 has 36 divisors (see below), whose sum is σ = 1728870. Its totient is φ = 171360.

The previous prime is 643043. The next prime is 643051. The reversal of 643050 is 50346.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 314721 + 328329 = 561^2 + 573^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (643051) by changing a digit.

643050 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 265 + ... + 1164.

2⁶⁴³⁰⁵⁰ is an apocalyptic number.

643050 is an abundant number, since it is smaller than the sum of its proper divisors (1085820).

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

643050 is a wasteful number, since it uses less digits than its factorization.

643050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 643050 is about 801.9039842774. The cubic root of 643050 is about 86.3140670805.

Adding to 643050 its reverse (50346), we get a palindrome (693396).

Subtracting from 643050 its reverse (50346), we obtain a cube (592704 = 84³).

The spelling of 643050 in words is "six hundred forty-three thousand, fifty".