643630325 has 12 divisors (see below), whose sum is σ = 859494468. Its totient is φ = 475296000.

The previous prime is 643630313. The next prime is 643630327. The reversal of 643630325 is 523036346.

643630325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 15476356 + 628153969 = 3934^2 + 25063^2 .

It is not a de Polignac number, because 643630325 - 2⁶ = 643630261 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643630291 and 643630300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643630327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 989876 + ... + 990525.

It is an arithmetic number, because the mean of its divisors is an integer number (71624539).

Almost surely, 2^643630325 is an apocalyptic number.

643630325 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

643630325 is a deficient number, since it is larger than the sum of its proper divisors (215864143).

643630325 is a wasteful number, since it uses less digits than its factorization.

643630325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980424 (or 1980419 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 32.

The square root of 643630325 is about 25369.8704174854. The cubic root of 643630325 is about 863.4002418624.

The spelling of 643630325 in words is "six hundred forty-three million, six hundred thirty thousand, three hundred twenty-five".