640086 has 8 divisors (see below), whose sum is σ = 1280184. Its totient is φ = 213360.

The previous prime is 640069. The next prime is 640099. The reversal of 640086 is 680046.

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

640086 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53335 + ... + 53346.

It is an arithmetic number, because the mean of its divisors is an integer number (160023).

2⁶⁴⁰⁰⁸⁶ is an apocalyptic number.

640086 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640086 is a wasteful number, since it uses less digits than its factorization.

640086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106686.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 640086 is about 800.0537481945. The cubic root of 640086 is about 86.1812474572.

The spelling of 640086 in words is "six hundred forty thousand, eighty-six".