643184472 has 64 divisors (see below), whose sum is σ = 1876792320. Its totient is φ = 179854848.

The previous prime is 643184467. The next prime is 643184473. The reversal of 643184472 is 274481346.

643184472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643184472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643184473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32833 + ... + 48624.

It is an arithmetic number, because the mean of its divisors is an integer number (29324880).

Almost surely, 2^643184472 is an apocalyptic number.

It is an amenable number.

643184472 is an abundant number, since it is smaller than the sum of its proper divisors (1233607848).

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

643184472 is a wasteful number, since it uses less digits than its factorization.

643184472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81520 (or 81516 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The square root of 643184472 is about 25361.0818381235. The cubic root of 643184472 is about 863.2008321007.

The spelling of 643184472 in words is "six hundred forty-three million, one hundred eighty-four thousand, four hundred seventy-two".