645308512 has 24 divisors (see below), whose sum is σ = 1301440392. Its totient is φ = 314784000.

The previous prime is 645308509. The next prime is 645308537. The reversal of 645308512 is 215803546.

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, 244614 + ... + 247237.

It is an arithmetic number, because the mean of its divisors is an integer number (54226683).

Almost surely, 2^645308512 is an apocalyptic number.

It is an amenable number.

645308512 is an abundant number, since it is smaller than the sum of its proper divisors (656131880).

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

645308512 is a wasteful number, since it uses less digits than its factorization.

645308512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491902 (or 491894 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 645308512 is about 25402.9232963452. The cubic root of 645308512 is about 864.1499939635.

The spelling of 645308512 in words is "six hundred forty-five million, three hundred eight thousand, five hundred twelve".