643066 has 8 divisors (see below), whose sum is σ = 979200. Its totient is φ = 316668.

The previous prime is 643061. The next prime is 643073. The reversal of 643066 is 660346.

It is a happy number.

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

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 643066.

It is not an unprimeable number, because it can be changed into a prime (643061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2266 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (122400).

2⁶⁴³⁰⁶⁶ is an apocalyptic number.

643066 is a deficient number, since it is larger than the sum of its proper divisors (336134).

643066 is a wasteful number, since it uses less digits than its factorization.

643066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4868.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 643066 is about 801.9139604721. The cubic root of 643066 is about 86.3147829469.

The spelling of 643066 in words is "six hundred forty-three thousand, sixty-six".