645045784 has 16 divisors (see below), whose sum is σ = 1238960520. Its totient is φ = 314656320.

The previous prime is 645045769. The next prime is 645045803. The reversal of 645045784 is 487540546.

It is a self number, because there is not a number n which added to its sum of digits gives 645045784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982974 + ... + 983629.

Almost surely, 2^645045784 is an apocalyptic number.

It is an amenable number.

645045784 is a deficient number, since it is larger than the sum of its proper divisors (593914736).

645045784 is a wasteful number, since it uses less digits than its factorization.

645045784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966650 (or 1966646 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 43.

The square root of 645045784 is about 25397.7515540254. The cubic root of 645045784 is about 864.0327026659.

The spelling of 645045784 in words is "six hundred forty-five million, forty-five thousand, seven hundred eighty-four".