645289384 has 16 divisors (see below), whose sum is σ = 1212045120. Its totient is φ = 322077360.

The previous prime is 645289373. The next prime is 645289391. The reversal of 645289384 is 483982546.

645289384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 66064 + ... + 75199.

It is an arithmetic number, because the mean of its divisors is an integer number (75752820).

Almost surely, 2^645289384 is an apocalyptic number.

It is an amenable number.

645289384 is a deficient number, since it is larger than the sum of its proper divisors (566755736).

645289384 is a wasteful number, since it uses less digits than its factorization.

645289384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141840 (or 141836 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The square root of 645289384 is about 25402.5468014528. The cubic root of 645289384 is about 864.1414556059.

The spelling of 645289384 in words is "six hundred forty-five million, two hundred eighty-nine thousand, three hundred eighty-four".