645243464 has 16 divisors (see below), whose sum is σ = 1210619520. Its totient is φ = 322411600.

The previous prime is 645243451. The next prime is 645243479. The reversal of 645243464 is 464342546.

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 in 3 ways as a sum of consecutive naturals, for example, 12812 + ... + 38139.

It is an arithmetic number, because the mean of its divisors is an integer number (75663720).

Almost surely, 2^645243464 is an apocalyptic number.

It is an amenable number.

645243464 is a deficient number, since it is larger than the sum of its proper divisors (565376056).

645243464 is a wasteful number, since it uses less digits than its factorization.

645243464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52540 (or 52536 counting only the distinct ones).

The product of its digits is 276480, while the sum is 38.

The square root of 645243464 is about 25401.6429389912. The cubic root of 645243464 is about 864.1209571454.

The spelling of 645243464 in words is "six hundred forty-five million, two hundred forty-three thousand, four hundred sixty-four".