643710 has 32 divisors (see below), whose sum is σ = 1584000. Its totient is φ = 167328.

The previous prime is 643703. The next prime is 643723. The reversal of 643710 is 17346.

It is a congruent number.

It is an unprimeable number.

643710 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 15 ways as a sum of consecutive naturals, for example, 1041 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (49500).

2⁶⁴³⁷¹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792000).

643710 is an abundant number, since it is smaller than the sum of its proper divisors (940290).

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

643710 is a wasteful number, since it uses less digits than its factorization.

643710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 643710 is about 802.3153993287. The cubic root of 643710 is about 86.3435867165.

The spelling of 643710 in words is "six hundred forty-three thousand, seven hundred ten".