643319450 has 12 divisors (see below), whose sum is σ = 1196574270. Its totient is φ = 257327760.

The previous prime is 643319447. The next prime is 643319473. The reversal of 643319450 is 54913346.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 597851401 + 45468049 = 24451^2 + 6743^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643319450.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 6433145 + ... + 6433244.

Almost surely, 2^643319450 is an apocalyptic number.

643319450 is a deficient number, since it is larger than the sum of its proper divisors (553254820).

643319450 is a wasteful number, since it uses less digits than its factorization.

643319450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12866401 (or 12866396 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 643319450 is about 25363.7428231718. The cubic root of 643319450 is about 863.2612113426.

The spelling of 643319450 in words is "six hundred forty-three million, three hundred nineteen thousand, four hundred fifty".