640118 has 16 divisors (see below), whose sum is σ = 1035504. Its totient is φ = 295680.

The previous prime is 640109. The next prime is 640121. The reversal of 640118 is 811046.

640118 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640118.

It is a congruent number.

It is an unprimeable number.

640118 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, 2138 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (64719).

2⁶⁴⁰¹¹⁸ is an apocalyptic number.

640118 is a deficient number, since it is larger than the sum of its proper divisors (395386).

640118 is a wasteful number, since it uses less digits than its factorization.

640118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 640118 is about 800.0737466009. The cubic root of 640118 is about 86.1826835944.

The spelling of 640118 in words is "six hundred forty thousand, one hundred eighteen".