643046422 has 4 divisors (see below), whose sum is σ = 964569636. Its totient is φ = 321523210.

The previous prime is 643046413. The next prime is 643046429. The reversal of 643046422 is 224640346.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643046429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160761604 + ... + 160761607.

It is an arithmetic number, because the mean of its divisors is an integer number (241142409).

Almost surely, 2^643046422 is an apocalyptic number.

643046422 is a deficient number, since it is larger than the sum of its proper divisors (321523214).

643046422 is a wasteful number, since it uses less digits than its factorization.

643046422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321523213.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 643046422 is about 25358.3600021768. The cubic root of 643046422 is about 863.1390699330.

Adding to 643046422 its reverse (224640346), we get a palindrome (867686768).

The spelling of 643046422 in words is "six hundred forty-three million, forty-six thousand, four hundred twenty-two".