645548912 has 20 divisors (see below), whose sum is σ = 1305132240. Its totient is φ = 308740608.

The previous prime is 645548899. The next prime is 645548923. The reversal of 645548912 is 219845546.

645548912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 876737 + ... + 877472.

It is an arithmetic number, because the mean of its divisors is an integer number (65256612).

Almost surely, 2^645548912 is an apocalyptic number.

It is an amenable number.

645548912 is an abundant number, since it is smaller than the sum of its proper divisors (659583328).

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

645548912 is a wasteful number, since it uses less digits than its factorization.

645548912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754240 (or 1754234 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The square root of 645548912 is about 25407.6545946295. The cubic root of 645548912 is about 864.2572893439.

The spelling of 645548912 in words is "six hundred forty-five million, five hundred forty-eight thousand, nine hundred twelve".