645030765 has 48 divisors (see below), whose sum is σ = 1137007872. Its totient is φ = 338228352.

The previous prime is 645030761. The next prime is 645030767. The reversal of 645030765 is 567030546.

645030765 is a `hidden beast` number, since 645 + 0 + 3 + 0 + 7 + 6 + 5 = 666.

It is not a de Polignac number, because 645030765 - 2² = 645030761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645030761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1392924 + ... + 1393386.

It is an arithmetic number, because the mean of its divisors is an integer number (23687664).

Almost surely, 2^645030765 is an apocalyptic number.

It is an amenable number.

645030765 is a deficient number, since it is larger than the sum of its proper divisors (491977107).

645030765 is a wasteful number, since it uses less digits than its factorization.

645030765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 645030765 is about 25397.4558765243. The cubic root of 645030765 is about 864.0259966779.

The spelling of 645030765 in words is "six hundred forty-five million, thirty thousand, seven hundred sixty-five".