643602 has 16 divisors (see below), whose sum is σ = 1307232. Its totient is φ = 211200.

The previous prime is 643589. The next prime is 643619. The reversal of 643602 is 206346.

It is an unprimeable number.

643602 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 in 7 ways as a sum of consecutive naturals, for example, 399 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (81702).

2⁶⁴³⁶⁰² is an apocalyptic number.

643602 is an abundant number, since it is smaller than the sum of its proper divisors (663630).

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

643602 is a wasteful number, since it uses less digits than its factorization.

643602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 643602 is about 802.2480913034. The cubic root of 643602 is about 86.3387576118.

Adding to 643602 its reverse (206346), we get a palindrome (849948).

The spelling of 643602 in words is "six hundred forty-three thousand, six hundred two".