643603442 has 16 divisors (see below), whose sum is σ = 1022842080. Its totient is φ = 302680128.

The previous prime is 643603421. The next prime is 643603451. The reversal of 643603442 is 244306346.

It is a junction number, because it is equal to n+sod(n) for n = 643603399 and 643603408.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 58409 + ... + 68547.

It is an arithmetic number, because the mean of its divisors is an integer number (63927630).

Almost surely, 2^643603442 is an apocalyptic number.

643603442 is a deficient number, since it is larger than the sum of its proper divisors (379238638).

643603442 is a wasteful number, since it uses less digits than its factorization.

643603442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025.

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 643603442 is about 25369.3405905632. The cubic root of 643603442 is about 863.3882209289.

Adding to 643603442 its reverse (244306346), we get a palindrome (887909788).

The spelling of 643603442 in words is "six hundred forty-three million, six hundred three thousand, four hundred forty-two".