643124828 has 12 divisors (see below), whose sum is σ = 1125727680. Its totient is φ = 321488352.

The previous prime is 643124819. The next prime is 643124869. The reversal of 643124828 is 828421346.

643124828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643124791 and 643124800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4088 + ... + 36096.

It is an arithmetic number, because the mean of its divisors is an integer number (93810640).

Almost surely, 2^643124828 is an apocalyptic number.

It is an amenable number.

643124828 is a deficient number, since it is larger than the sum of its proper divisors (482602852).

643124828 is a wasteful number, since it uses less digits than its factorization.

643124828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37036 (or 37034 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 643124828 is about 25359.9059146520. The cubic root of 643124828 is about 863.1741490654.

The spelling of 643124828 in words is "six hundred forty-three million, one hundred twenty-four thousand, eight hundred twenty-eight".