643012632 has 48 divisors (see below), whose sum is σ = 1743080040. Its totient is φ = 214142208.

The previous prime is 643012631. The next prime is 643012637. The reversal of 643012632 is 236210346.

643012632 is a `hidden beast` number, since 643 + 0 + 12 + 6 + 3 + 2 = 666.

It is a super-3 number, since 3×643012632³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643012596 and 643012605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643012631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90688 + ... + 97520.

Almost surely, 2^643012632 is an apocalyptic number.

It is an amenable number.

643012632 is an abundant number, since it is smaller than the sum of its proper divisors (1100067408).

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

643012632 is a wasteful number, since it uses less digits than its factorization.

643012632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8152 (or 8145 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 643012632 is about 25357.6937437142. The cubic root of 643012632 is about 863.1239512837.

Adding to 643012632 its reverse (236210346), we get a palindrome (879222978).

The spelling of 643012632 in words is "six hundred forty-three million, twelve thousand, six hundred thirty-two".