645864484 has 12 divisors (see below), whose sum is σ = 1137032064. Its totient is φ = 320998184.

The previous prime is 645864463. The next prime is 645864497. The reversal of 645864484 is 484468546.

645864484 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, 482764 + ... + 484099.

It is an arithmetic number, because the mean of its divisors is an integer number (94752672).

Almost surely, 2^645864484 is an apocalyptic number.

It is an amenable number.

645864484 is a deficient number, since it is larger than the sum of its proper divisors (491167580).

645864484 is a wasteful number, since it uses less digits than its factorization.

645864484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967034 (or 967032 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 49.

The square root of 645864484 is about 25413.8640115981. The cubic root of 645864484 is about 864.3980950814.

The spelling of 645864484 in words is "six hundred forty-five million, eight hundred sixty-four thousand, four hundred eighty-four".