640196 has 6 divisors (see below), whose sum is σ = 1120350. Its totient is φ = 320096.

The previous prime is 640193. The next prime is 640219. The reversal of 640196 is 691046.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 196 = 800^2 + 14^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640196.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80021 + ... + 80028.

It is an arithmetic number, because the mean of its divisors is an integer number (186725).

2⁶⁴⁰¹⁹⁶ is an apocalyptic number.

It is an amenable number.

640196 is a deficient number, since it is larger than the sum of its proper divisors (480154).

640196 is a wasteful number, since it uses less digits than its factorization.

640196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160053 (or 160051 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 640196 is about 800.1224906225. The cubic root of 640196 is about 86.1861839784.

The spelling of 640196 in words is "six hundred forty thousand, one hundred ninety-six".