645208568228 has 48 divisors (see below), whose sum is σ = 1303894139520. Its totient is φ = 273630790656.

The previous prime is 645208568197. The next prime is 645208568231. The reversal of 645208568228 is 822865802546.

645208568228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33198818 + ... + 33218246.

It is an arithmetic number, because the mean of its divisors is an integer number (27164461240).

Almost surely, 2^645208568228 is an apocalyptic number.

It is an amenable number.

645208568228 is an abundant number, since it is smaller than the sum of its proper divisors (658685571292).

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

645208568228 is a wasteful number, since it uses less digits than its factorization.

645208568228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31764 (or 31762 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 56.

The spelling of 645208568228 in words is "six hundred forty-five billion, two hundred eight million, five hundred sixty-eight thousand, two hundred twenty-eight".