643502476 has 6 divisors (see below), whose sum is σ = 1126129340. Its totient is φ = 321751236.

The previous prime is 643502473. The next prime is 643502477. The reversal of 643502476 is 674205346.

It is not an unprimeable number, because it can be changed into a prime (643502471) 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 as a sum of consecutive naturals, namely, 80437806 + ... + 80437813.

Almost surely, 2^643502476 is an apocalyptic number.

It is an amenable number.

643502476 is a deficient number, since it is larger than the sum of its proper divisors (482626864).

643502476 is a wasteful number, since it uses less digits than its factorization.

643502476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160875623 (or 160875621 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 643502476 is about 25367.3505908678. The cubic root of 643502476 is about 863.3430702413.

The spelling of 643502476 in words is "six hundred forty-three million, five hundred two thousand, four hundred seventy-six".