643024820 has 24 divisors (see below), whose sum is σ = 1352774304. Its totient is φ = 256748576.

The previous prime is 643024819. The next prime is 643024829. The reversal of 643024820 is 28420346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643024829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17294 + ... + 39813.

It is an arithmetic number, because the mean of its divisors is an integer number (56365596).

Almost surely, 2^643024820 is an apocalyptic number.

It is an amenable number.

643024820 is an abundant number, since it is smaller than the sum of its proper divisors (709749484).

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

643024820 is a wasteful number, since it uses less digits than its factorization.

643024820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57679 (or 57677 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 643024820 is about 25357.9340641149. The cubic root of 643024820 is about 863.1294046179.

The spelling of 643024820 in words is "six hundred forty-three million, twenty-four thousand, eight hundred twenty".