645188368 has 40 divisors (see below), whose sum is σ = 1407695616. Its totient is φ = 283804800.

The previous prime is 645188363. The next prime is 645188407. The reversal of 645188368 is 863881546.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (645188363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53671 + ... + 64582.

Almost surely, 2^645188368 is an apocalyptic number.

It is an amenable number.

645188368 is an abundant number, since it is smaller than the sum of its proper divisors (762507248).

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

645188368 is a wasteful number, since it uses less digits than its factorization.

645188368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118303 (or 118297 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 645188368 is about 25400.5584190584. The cubic root of 645188368 is about 864.0963612804.

The spelling of 645188368 in words is "six hundred forty-five million, one hundred eighty-eight thousand, three hundred sixty-eight".