640108 has 12 divisors (see below), whose sum is σ = 1280272. Its totient is φ = 274320.

The previous prime is 640099. The next prime is 640109. The reversal of 640108 is 801046.

640108 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (640109) 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, 11403 + ... + 11458.

2⁶⁴⁰¹⁰⁸ is an apocalyptic number.

It is an amenable number.

640108 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.

640108 is a wasteful number, since it uses less digits than its factorization.

640108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22872 (or 22870 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 640108 is about 800.0674971526. The cubic root of 640108 is about 86.1822348067.

The spelling of 640108 in words is "six hundred forty thousand, one hundred eight".