645584984 has 32 divisors (see below), whose sum is σ = 1321790400. Its totient is φ = 293164320.

The previous prime is 645584971. The next prime is 645585001. The reversal of 645584984 is 489485546.

645584984 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, 107879 + ... + 113705.

It is an arithmetic number, because the mean of its divisors is an integer number (41305950).

Almost surely, 2^645584984 is an apocalyptic number.

It is an amenable number.

645584984 is an abundant number, since it is smaller than the sum of its proper divisors (676205416).

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

645584984 is a wasteful number, since it uses less digits than its factorization.

645584984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103 (or 7099 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 53.

The square root of 645584984 is about 25408.3644495272. The cubic root of 645584984 is about 864.2733867084.

The spelling of 645584984 in words is "six hundred forty-five million, five hundred eighty-four thousand, nine hundred eighty-four".