643248984 has 64 divisors (see below), whose sum is σ = 1840204800. Its totient is φ = 183550464.

The previous prime is 643248973. The next prime is 643248989. The reversal of 643248984 is 489842346.

643248984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643248989) 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, 162177 + ... + 166095.

It is an arithmetic number, because the mean of its divisors is an integer number (28753200).

Almost surely, 2^643248984 is an apocalyptic number.

It is an amenable number.

643248984 is an abundant number, since it is smaller than the sum of its proper divisors (1196955816).

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

643248984 is a wasteful number, since it uses less digits than its factorization.

643248984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912 (or 4908 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The square root of 643248984 is about 25362.3536762659. The cubic root of 643248984 is about 863.2296910843.

The spelling of 643248984 in words is "six hundred forty-three million, two hundred forty-eight thousand, nine hundred eighty-four".