643434132 has 24 divisors (see below), whose sum is σ = 1637832672. Its totient is φ = 194980000.

The previous prime is 643434097. The next prime is 643434149. The reversal of 643434132 is 231434346.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 643434132.

It is a congruent number.

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, 2437119 + ... + 2437382.

It is an arithmetic number, because the mean of its divisors is an integer number (68243028).

Almost surely, 2^643434132 is an apocalyptic number.

It is an amenable number.

643434132 is an abundant number, since it is smaller than the sum of its proper divisors (994398540).

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

643434132 is a wasteful number, since it uses less digits than its factorization.

643434132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874519 (or 4874517 counting only the distinct ones).

The product of its digits is 20736, while the sum is 30.

The square root of 643434132 is about 25366.0034692105. The cubic root of 643434132 is about 863.3125050091.

Adding to 643434132 its reverse (231434346), we get a palindrome (874868478).

The spelling of 643434132 in words is "six hundred forty-three million, four hundred thirty-four thousand, one hundred thirty-two".