645120304 has 10 divisors (see below), whose sum is σ = 1249920620. Its totient is φ = 322560144.

The previous prime is 645120299. The next prime is 645120317. The reversal of 645120304 is 403021546.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20159994 + ... + 20160025.

It is an arithmetic number, because the mean of its divisors is an integer number (124992062).

Almost surely, 2^645120304 is an apocalyptic number.

It is an amenable number.

645120304 is a deficient number, since it is larger than the sum of its proper divisors (604800316).

645120304 is a wasteful number, since it uses less digits than its factorization.

645120304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40320027 (or 40320021 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 645120304 is about 25399.2185706569. The cubic root of 645120304 is about 864.0659743288.

The spelling of 645120304 in words is "six hundred forty-five million, one hundred twenty thousand, three hundred four".