645898568 has 32 divisors (see below), whose sum is σ = 1389484800. Its totient is φ = 275730432.

The previous prime is 645898553. The next prime is 645898577. The reversal of 645898568 is 865898546.

645898568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8048 + ... + 36831.

It is an arithmetic number, because the mean of its divisors is an integer number (43421400).

Almost surely, 2^645898568 is an apocalyptic number.

It is an amenable number.

645898568 is an abundant number, since it is smaller than the sum of its proper divisors (743586232).

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

645898568 is a wasteful number, since it uses less digits than its factorization.

645898568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45149 (or 45145 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 59.

The square root of 645898568 is about 25414.5345816129. The cubic root of 645898568 is about 864.4133003487.

The spelling of 645898568 in words is "six hundred forty-five million, eight hundred ninety-eight thousand, five hundred sixty-eight".