204640360212 has 24 divisors (see below), whose sum is σ = 478239112512. Its totient is φ = 68107033600.

The previous prime is 204640360189. The next prime is 204640360219. The reversal of 204640360212 is 212063046402.

It is a super-4 number, since 4×204640360212⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 204640360212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204640360219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13294464 + ... + 13309847.

It is an arithmetic number, because the mean of its divisors is an integer number (19926629688).

Almost surely, 2^204640360212 is an apocalyptic number.

It is an amenable number.

204640360212 is an abundant number, since it is smaller than the sum of its proper divisors (273598752300).

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

204640360212 is a wasteful number, since it uses less digits than its factorization.

204640360212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26604959 (or 26604957 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 204640360212 in words is "two hundred four billion, six hundred forty million, three hundred sixty thousand, two hundred twelve".