640192 has 28 divisors (see below), whose sum is σ = 1452880. Its totient is φ = 274176.

The previous prime is 640163. The next prime is 640193. The reversal of 640192 is 291046.

It is a tau number, because it is divible by the number of its divisors (28).

640192 is a modest number, since divided by 192 gives 64 as remainder.

It is not an unprimeable number, because it can be changed into a prime (640193) by changing a digit.

640192 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267 + ... + 1162.

2⁶⁴⁰¹⁹² is an apocalyptic number.

It is an amenable number.

640192 is an abundant number, since it is smaller than the sum of its proper divisors (812688).

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

640192 is a wasteful number, since it uses less digits than its factorization.

640192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1438 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 640192 is about 800.1199910013. The cubic root of 640192 is about 86.1860044784.

The spelling of 640192 in words is "six hundred forty thousand, one hundred ninety-two".