645875520 has 56 divisors (see below), whose sum is σ = 2050657824. Its totient is φ = 172233216.

The previous prime is 645875519. The next prime is 645875521. The reversal of 645875520 is 25578546.

645875520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645875519) and next prime (645875521).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645875521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335434 + ... + 337353.

Almost surely, 2^645875520 is an apocalyptic number.

645875520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645875520 is an abundant number, since it is smaller than the sum of its proper divisors (1404782304).

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

645875520 is a wasteful number, since it uses less digits than its factorization.

645875520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672807 (or 672797 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 645875520 is about 25414.0811362520. The cubic root of 645875520 is about 864.4030184274.

It can be divided in two parts, 64587 and 5520, that added together give a palindrome (70107).

The spelling of 645875520 in words is "six hundred forty-five million, eight hundred seventy-five thousand, five hundred twenty".