643004425 has 24 divisors (see below), whose sum is σ = 914016896. Its totient is φ = 439568640.

The previous prime is 643004393. The next prime is 643004473. The reversal of 643004425 is 524400346.

It is not a de Polignac number, because 643004425 - 2⁵ = 643004393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643004393 and 643004402.

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 23 ways as a sum of consecutive naturals, for example, 53524 + ... + 64426.

Almost surely, 2^643004425 is an apocalyptic number.

It is an amenable number.

643004425 is a deficient number, since it is larger than the sum of its proper divisors (271012471).

643004425 is a wasteful number, since it uses less digits than its factorization.

643004425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11257 (or 11252 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 643004425 is about 25357.5319185444. The cubic root of 643004425 is about 863.1202791483.

The spelling of 643004425 in words is "six hundred forty-three million, four thousand, four hundred twenty-five".