643475716 has 24 divisors (see below), whose sum is σ = 1219982400. Its totient is φ = 295206432.

The previous prime is 643475699. The next prime is 643475797. The reversal of 643475716 is 617574346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28366 + ... + 45733.

It is an arithmetic number, because the mean of its divisors is an integer number (50832600).

Almost surely, 2^643475716 is an apocalyptic number.

It is an amenable number.

643475716 is a deficient number, since it is larger than the sum of its proper divisors (576506684).

643475716 is a wasteful number, since it uses less digits than its factorization.

643475716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74283 (or 74281 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 643475716 is about 25366.8231357417. The cubic root of 643475716 is about 863.3311027241.

The spelling of 643475716 in words is "six hundred forty-three million, four hundred seventy-five thousand, seven hundred sixteen".