643007676 has 12 divisors (see below), whose sum is σ = 1500351272. Its totient is φ = 214335888.

The previous prime is 643007669. The next prime is 643007689. The reversal of 643007676 is 676700346.

It is a tau number, because it is divible by the number of its divisors (12).

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, 26791975 + ... + 26791998.

Almost surely, 2^643007676 is an apocalyptic number.

It is an amenable number.

643007676 is an abundant number, since it is smaller than the sum of its proper divisors (857343596).

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

643007676 is a wasteful number, since it uses less digits than its factorization.

643007676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53583980 (or 53583978 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 39.

The square root of 643007676 is about 25357.5960217052. The cubic root of 643007676 is about 863.1217337776.

The spelling of 643007676 in words is "six hundred forty-three million, seven thousand, six hundred seventy-six".