643270 has 8 divisors (see below), whose sum is σ = 1157904. Its totient is φ = 257304.

The previous prime is 643243. The next prime is 643273. The reversal of 643270 is 72346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643273) by changing a digit.

643270 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, 32154 + ... + 32173.

It is an arithmetic number, because the mean of its divisors is an integer number (144738).

2⁶⁴³²⁷⁰ is an apocalyptic number.

643270 is a deficient number, since it is larger than the sum of its proper divisors (514634).

643270 is a wasteful number, since it uses less digits than its factorization.

643270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64334.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 643270 is about 802.0411460767. The cubic root of 643270 is about 86.3239092025.

The spelling of 643270 in words is "six hundred forty-three thousand, two hundred seventy".