645441008 has 40 divisors (see below), whose sum is σ = 1283251200. Its totient is φ = 314322624.

The previous prime is 645440977. The next prime is 645441011. The reversal of 645441008 is 800144546.

645441008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 287153 + ... + 289391.

It is an arithmetic number, because the mean of its divisors is an integer number (32081280).

Almost surely, 2^645441008 is an apocalyptic number.

It is an amenable number.

645441008 is a deficient number, since it is larger than the sum of its proper divisors (637810192).

645441008 is a wasteful number, since it uses less digits than its factorization.

645441008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709 (or 2703 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 645441008 is about 25405.5310513282. The cubic root of 645441008 is about 864.2091329025.

The spelling of 645441008 in words is "six hundred forty-five million, four hundred forty-one thousand, eight".