640112 has 20 divisors (see below), whose sum is σ = 1353336. Its totient is φ = 290880.

The previous prime is 640109. The next prime is 640121. The reversal of 640112 is 211046.

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, 1643 + ... + 1994.

2⁶⁴⁰¹¹² is an apocalyptic number.

It is an amenable number.

640112 is an abundant number, since it is smaller than the sum of its proper divisors (713224).

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

640112 is a wasteful number, since it uses less digits than its factorization.

640112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656 (or 3650 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 640112 is about 800.0699969378. The cubic root of 640112 is about 86.1824143223.

Adding to 640112 its reverse (211046), we get a palindrome (851158).

The spelling of 640112 in words is "six hundred forty thousand, one hundred twelve".