643044 has 24 divisors (see below), whose sum is σ = 1538208. Its totient is φ = 208960.

The previous prime is 643043. The next prime is 643051. The reversal of 643044 is 440346.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 643044.

It is not an unprimeable number, because it can be changed into a prime (643043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 1145.

It is an arithmetic number, because the mean of its divisors is an integer number (64092).

2⁶⁴³⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

643044 is an abundant number, since it is smaller than the sum of its proper divisors (895164).

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

643044 is a wasteful number, since it uses less digits than its factorization.

643044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 643044 is about 801.9002431724. The cubic root of 643044 is about 86.3137986276.

The spelling of 643044 in words is "six hundred forty-three thousand, forty-four".