643616476 has 24 divisors (see below), whose sum is σ = 1147939520. Its totient is φ = 315686592.

The previous prime is 643616461. The next prime is 643616503. The reversal of 643616476 is 674616346.

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 7 ways as a sum of consecutive naturals, for example, 43126 + ... + 56098.

Almost surely, 2^643616476 is an apocalyptic number.

It is an amenable number.

643616476 is a deficient number, since it is larger than the sum of its proper divisors (504323044).

643616476 is a wasteful number, since it uses less digits than its factorization.

643616476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213 (or 13211 counting only the distinct ones).

The product of its digits is 435456, while the sum is 43.

The square root of 643616476 is about 25369.5974741422. The cubic root of 643616476 is about 863.3940492208.

The spelling of 643616476 in words is "six hundred forty-three million, six hundred sixteen thousand, four hundred seventy-six".