640212202 has 48 divisors (see below), whose sum is σ = 1139177088. Its totient is φ = 264258720.

The previous prime is 640212179. The next prime is 640212203. The reversal of 640212202 is 202212046.

640212202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640212203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3833523 + ... + 3833689.

It is an arithmetic number, because the mean of its divisors is an integer number (23732856).

Almost surely, 2^640212202 is an apocalyptic number.

640212202 is a deficient number, since it is larger than the sum of its proper divisors (498964886).

640212202 is a wasteful number, since it uses less digits than its factorization.

640212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 640212202 is about 25302.4149440325. The cubic root of 640212202 is about 861.8691103527.

Adding to 640212202 its reverse (202212046), we get a palindrome (842424248).

The spelling of 640212202 in words is "six hundred forty million, two hundred twelve thousand, two hundred two".