645030940 has 24 divisors (see below), whose sum is σ = 1357800192. Its totient is φ = 257396160.

The previous prime is 645030913. The next prime is 645030959. The reversal of 645030940 is 49030546.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 29884 + ... + 46723.

It is an arithmetic number, because the mean of its divisors is an integer number (56575008).

Almost surely, 2^645030940 is an apocalyptic number.

It is an amenable number.

645030940 is an abundant number, since it is smaller than the sum of its proper divisors (712769252).

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

645030940 is a wasteful number, since it uses less digits than its factorization.

645030940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77037 (or 77035 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 645030940 is about 25397.4593217511. The cubic root of 645030940 is about 864.0260748161.

The spelling of 645030940 in words is "six hundred forty-five million, thirty thousand, nine hundred forty".