643112512 has 28 divisors (see below), whose sum is σ = 1458488320. Its totient is φ = 275619456.

The previous prime is 643112461. The next prime is 643112521. The reversal of 643112512 is 215211346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

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, 717312 + ... + 718207.

Almost surely, 2^643112512 is an apocalyptic number.

It is an amenable number.

643112512 is an abundant number, since it is smaller than the sum of its proper divisors (815375808).

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

643112512 is a wasteful number, since it uses less digits than its factorization.

643112512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435538 (or 1435528 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 643112512 is about 25359.6630892447. The cubic root of 643112512 is about 863.1686390305.

Adding to 643112512 its reverse (215211346), we get a palindrome (858323858).

The spelling of 643112512 in words is "six hundred forty-three million, one hundred twelve thousand, five hundred twelve".