643310442 has 24 divisors (see below), whose sum is σ = 1396720416. Its totient is φ = 213993576.

The previous prime is 643310407. The next prime is 643310443. The reversal of 643310442 is 244013346.

643310442 is a `hidden beast` number, since 643 + 3 + 10 + 4 + 4 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (643310443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27928 + ... + 45459.

It is an arithmetic number, because the mean of its divisors is an integer number (58196684).

Almost surely, 2^643310442 is an apocalyptic number.

643310442 is an abundant number, since it is smaller than the sum of its proper divisors (753409974).

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

643310442 is a wasteful number, since it uses less digits than its factorization.

643310442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73882 (or 73879 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 643310442 is about 25363.5652462346. The cubic root of 643310442 is about 863.2571820881.

Adding to 643310442 its reverse (244013346), we get a palindrome (887323788).

The spelling of 643310442 in words is "six hundred forty-three million, three hundred ten thousand, four hundred forty-two".