643248983 has 6 divisors (see below), whose sum is σ = 696536064. Its totient is φ = 593768136.

The previous prime is 643248973. The next prime is 643248989. The reversal of 643248983 is 389842346.

It is not a de Polignac number, because 643248983 - 2⁶ = 643248919 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1902935 + ... + 1903272.

It is an arithmetic number, because the mean of its divisors is an integer number (116089344).

Almost surely, 2^643248983 is an apocalyptic number.

643248983 is a deficient number, since it is larger than the sum of its proper divisors (53287081).

643248983 is a wasteful number, since it uses less digits than its factorization.

643248983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806233 (or 3806220 counting only the distinct ones).

The product of its digits is 995328, while the sum is 47.

The square root of 643248983 is about 25362.3536565517. The cubic root of 643248983 is about 863.2296906369.

The spelling of 643248983 in words is "six hundred forty-three million, two hundred forty-eight thousand, nine hundred eighty-three".