643059886 has 16 divisors (see below), whose sum is σ = 1108993536. Its totient is φ = 273945816.

The previous prime is 643059863. The next prime is 643059887. The reversal of 643059886 is 688950346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643059887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 135186 + ... + 139861.

It is an arithmetic number, because the mean of its divisors is an integer number (69312096).

Almost surely, 2^643059886 is an apocalyptic number.

643059886 is a deficient number, since it is larger than the sum of its proper divisors (465933650).

643059886 is a wasteful number, since it uses less digits than its factorization.

643059886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275223.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 643059886 is about 25358.6254753683. The cubic root of 643059886 is about 863.1450939789.

The spelling of 643059886 in words is "six hundred forty-three million, fifty-nine thousand, eight hundred eighty-six".