645240028633230 has 256 divisors, whose sum is σ = 1639390599714816. Its totient is φ = 162351643576320.

The previous prime is 645240028633159. The next prime is 645240028633231. The reversal of 645240028633230 is 32336820042546.

It is a super-3 number, since 3×645240028633230³ (a number of 45 digits) contains 333 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 645240028633230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645240028633231) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1582923724 + ... + 1583331296.

It is an arithmetic number, because the mean of its divisors is an integer number (6403869530136).

Almost surely, 2^{645240028633230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645240028633230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819695299857408).

645240028633230 is an abundant number, since it is smaller than the sum of its proper divisors (994150571081586).

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

645240028633230 is a wasteful number, since it uses less digits than its factorization.

645240028633230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408011.

The product of its (nonzero) digits is 4976640, while the sum is 48.

Adding to 645240028633230 its reverse (32336820042546), we get a palindrome (677576848675776).

The spelling of 645240028633230 in words is "six hundred forty-five trillion, two hundred forty billion, twenty-eight million, six hundred thirty-three thousand, two hundred thirty".