640116 has 24 divisors (see below), whose sum is σ = 1659840. Its totient is φ = 213336.

The previous prime is 640109. The next prime is 640121. The reversal of 640116 is 611046.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

640116 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, 2856 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (69160).

2⁶⁴⁰¹¹⁶ is an apocalyptic number.

It is an amenable number.

640116 is an abundant number, since it is smaller than the sum of its proper divisors (1019724).

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

640116 is a wasteful number, since it uses less digits than its factorization.

640116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940 (or 5932 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 640116 is about 800.0724967151. The cubic root of 640116 is about 86.1825938372.

The spelling of 640116 in words is "six hundred forty thousand, one hundred sixteen".