643313712 has 40 divisors (see below), whose sum is σ = 1700547904. Its totient is φ = 209450304.

The previous prime is 643313707. The next prime is 643313719. The reversal of 643313712 is 217313346.

It is a self number, because there is not a number n which added to its sum of digits gives 643313712.

It is not an unprimeable number, because it can be changed into a prime (643313719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153778 + ... + 157905.

Almost surely, 2^643313712 is an apocalyptic number.

It is an amenable number.

643313712 is an abundant number, since it is smaller than the sum of its proper divisors (1057234192).

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

643313712 is a wasteful number, since it uses less digits than its factorization.

643313712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311737 (or 311731 counting only the distinct ones).

The product of its digits is 9072, while the sum is 30.

The square root of 643313712 is about 25363.6297086990. The cubic root of 643313712 is about 863.2586447548.

The spelling of 643313712 in words is "six hundred forty-three million, three hundred thirteen thousand, seven hundred twelve".