643988062 has 8 divisors (see below), whose sum is σ = 968751000. Its totient is φ = 321071064.

The previous prime is 643988057. The next prime is 643988077. The reversal of 643988062 is 260889346.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460612 + ... + 462007.

It is an arithmetic number, because the mean of its divisors is an integer number (121093875).

Almost surely, 2^643988062 is an apocalyptic number.

643988062 is a deficient number, since it is larger than the sum of its proper divisors (324762938).

643988062 is a wasteful number, since it uses less digits than its factorization.

643988062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922970.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 643988062 is about 25376.9198682582. The cubic root of 643988062 is about 863.5601747687.

The spelling of 643988062 in words is "six hundred forty-three million, nine hundred eighty-eight thousand, sixty-two".