640202 has 4 divisors (see below), whose sum is σ = 960306. Its totient is φ = 320100.

The previous prime is 640193. The next prime is 640219. The reversal of 640202 is 202046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 48841 = 769^2 + 221^2 .

640202 is a modest number, since divided by 202 gives 64 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640202.

It is an unprimeable number.

640202 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 as a sum of consecutive naturals, namely, 160049 + ... + 160052.

2⁶⁴⁰²⁰² is an apocalyptic number.

640202 is a deficient number, since it is larger than the sum of its proper divisors (320104).

640202 is a wasteful number, since it uses less digits than its factorization.

640202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320103.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 640202 is about 800.1262400397. The cubic root of 640202 is about 86.1864532269.

Adding to 640202 its reverse (202046), we get a palindrome (842248).

The spelling of 640202 in words is "six hundred forty thousand, two hundred two".