643782072 has 32 divisors (see below), whose sum is σ = 1610179200. Its totient is φ = 214497504.

The previous prime is 643782059. The next prime is 643782079. The reversal of 643782072 is 270287346.

It is a super-2 number, since 2×643782072² = 828910712457226368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643782072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643782079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65973 + ... + 75099.

It is an arithmetic number, because the mean of its divisors is an integer number (50318100).

Almost surely, 2^643782072 is an apocalyptic number.

It is an amenable number.

643782072 is an abundant number, since it is smaller than the sum of its proper divisors (966397128).

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

643782072 is a wasteful number, since it uses less digits than its factorization.

643782072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12075 (or 12071 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 643782072 is about 25372.8609344709. The cubic root of 643782072 is about 863.4680903856.

The spelling of 643782072 in words is "six hundred forty-three million, seven hundred eighty-two thousand, seventy-two".