643358 has 4 divisors (see below), whose sum is σ = 965040. Its totient is φ = 321678.

The previous prime is 643303. The next prime is 643369. The reversal of 643358 is 853346.

643358 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 643358.

It is a congruent number.

It is an unprimeable number.

643358 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160838 + ... + 160841.

It is an arithmetic number, because the mean of its divisors is an integer number (241260).

2⁶⁴³³⁵⁸ is an apocalyptic number.

643358 is a deficient number, since it is larger than the sum of its proper divisors (321682).

643358 is a wasteful number, since it uses less digits than its factorization.

643358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321681.

The product of its digits is 8640, while the sum is 29.

The square root of 643358 is about 802.0960042289. The cubic root of 643358 is about 86.3278454230.

It can be divided in two parts, 643 and 358, that added together give a palindrome (1001).

The spelling of 643358 in words is "six hundred forty-three thousand, three hundred fifty-eight".