643423446 has 32 divisors (see below), whose sum is σ = 1513939680. Its totient is φ = 201858048.

The previous prime is 643423439. The next prime is 643423457. The reversal of 643423446 is 644324346.

643423446 is a `hidden beast` number, since 643 + 4 + 2 + 3 + 4 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 643423446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349531 + ... + 351366.

It is an arithmetic number, because the mean of its divisors is an integer number (47310615).

Almost surely, 2^643423446 is an apocalyptic number.

643423446 is an abundant number, since it is smaller than the sum of its proper divisors (870516234).

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

643423446 is a wasteful number, since it uses less digits than its factorization.

643423446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700925 (or 700919 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

The square root of 643423446 is about 25365.7928320800. The cubic root of 643423446 is about 863.3077257535.

The spelling of 643423446 in words is "six hundred forty-three million, four hundred twenty-three thousand, four hundred forty-six".