643086 has 16 divisors (see below), whose sum is σ = 1429200. Its totient is φ = 214344.

The previous prime is 643081. The next prime is 643087. The reversal of 643086 is 680346.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643081) by changing a digit.

643086 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 7 ways as a sum of consecutive naturals, for example, 5901 + ... + 6008.

It is an arithmetic number, because the mean of its divisors is an integer number (89325).

2⁶⁴³⁰⁸⁶ is an apocalyptic number.

643086 is an abundant number, since it is smaller than the sum of its proper divisors (786114).

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

643086 is a wasteful number, since it uses less digits than its factorization.

643086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11920 (or 11914 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 643086 is about 801.9264305409. The cubic root of 643086 is about 86.3156777632.

The spelling of 643086 in words is "six hundred forty-three thousand, eighty-six".