643421362 has 4 divisors (see below), whose sum is σ = 965132046. Its totient is φ = 321710680.

The previous prime is 643421353. The next prime is 643421381. The reversal of 643421362 is 263124346.

643421362 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 263124346 = 2 ⋅131562173.

It can be written as a sum of positive squares in only one way, i.e., 629959801 + 13461561 = 25099^2 + 3669^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160855339 + ... + 160855342.

Almost surely, 2^643421362 is an apocalyptic number.

643421362 is a deficient number, since it is larger than the sum of its proper divisors (321710684).

643421362 is a wasteful number, since it uses less digits than its factorization.

643421362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321710683.

The product of its digits is 20736, while the sum is 31.

The square root of 643421362 is about 25365.7517531021. The cubic root of 643421362 is about 863.3067936896.

The spelling of 643421362 in words is "six hundred forty-three million, four hundred twenty-one thousand, three hundred sixty-two".