645160244 has 24 divisors (see below), whose sum is σ = 1147301568. Its totient is φ = 317378880.

The previous prime is 645160237. The next prime is 645160247. The reversal of 645160244 is 442061546.

645160244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645160244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645160247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153272 + ... + 157424.

It is an arithmetic number, because the mean of its divisors is an integer number (47804232).

Almost surely, 2^645160244 is an apocalyptic number.

It is an amenable number.

645160244 is a deficient number, since it is larger than the sum of its proper divisors (502141324).

645160244 is a wasteful number, since it uses less digits than its factorization.

645160244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4775 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 645160244 is about 25400.0048031492. The cubic root of 645160244 is about 864.0838056711.

The spelling of 645160244 in words is "six hundred forty-five million, one hundred sixty thousand, two hundred forty-four".