643421524 has 6 divisors (see below), whose sum is σ = 1125987674. Its totient is φ = 321710760.

The previous prime is 643421507. The next prime is 643421539. The reversal of 643421524 is 425124346.

643421524 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 only one way, i.e., 601819024 + 41602500 = 24532^2 + 6450^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80427687 + ... + 80427694.

Almost surely, 2^643421524 is an apocalyptic number.

It is an amenable number.

643421524 is a deficient number, since it is larger than the sum of its proper divisors (482566150).

643421524 is a wasteful number, since it uses less digits than its factorization.

643421524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160855385 (or 160855383 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 643421524 is about 25365.7549463839. The cubic root of 643421524 is about 863.3068661438.

The spelling of 643421524 in words is "six hundred forty-three million, four hundred twenty-one thousand, five hundred twenty-four".