643610 has 16 divisors (see below), whose sum is σ = 1264032. Its totient is φ = 234000.

The previous prime is 643589. The next prime is 643619. The reversal of 643610 is 16346.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (643619) 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, 2816 + ... + 3035.

It is an arithmetic number, because the mean of its divisors is an integer number (79002).

2⁶⁴³⁶¹⁰ is an apocalyptic number.

643610 is a deficient number, since it is larger than the sum of its proper divisors (620422).

643610 is a wasteful number, since it uses less digits than its factorization.

643610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 643610 is about 802.2530772767. The cubic root of 643610 is about 86.3391153418.

Adding to 643610 its reverse (16346), we get a palindrome (659956).

Subtracting from 643610 its reverse (16346), we obtain a square (627264 = 792²).

It can be divided in two parts, 6436 and 10, that added together give a palindrome (6446).

The spelling of 643610 in words is "six hundred forty-three thousand, six hundred ten".