643596 has 12 divisors (see below), whose sum is σ = 1501752. Its totient is φ = 214528.

The previous prime is 643589. The next prime is 643619. The reversal of 643596 is 695346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×643596² = 828431622432, which contains 22 as substring.

It is a nialpdrome in base 15.

It is an unprimeable number.

643596 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 3 ways as a sum of consecutive naturals, for example, 26805 + ... + 26828.

It is an arithmetic number, because the mean of its divisors is an integer number (125146).

2⁶⁴³⁵⁹⁶ is an apocalyptic number.

It is an amenable number.

643596 is an abundant number, since it is smaller than the sum of its proper divisors (858156).

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

643596 is a wasteful number, since it uses less digits than its factorization.

643596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53640 (or 53638 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 643596 is about 802.2443518031. The cubic root of 643596 is about 86.3384893124.

The spelling of 643596 in words is "six hundred forty-three thousand, five hundred ninety-six".