643024049 has 4 divisors (see below), whose sum is σ = 676867440. Its totient is φ = 609180660.

The previous prime is 643024013. The next prime is 643024051. The reversal of 643024049 is 940420346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 643024049 - 2¹² = 643019953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643024849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16921667 + ... + 16921704.

It is an arithmetic number, because the mean of its divisors is an integer number (169216860).

Almost surely, 2^643024049 is an apocalyptic number.

It is an amenable number.

643024049 is a deficient number, since it is larger than the sum of its proper divisors (33843391).

643024049 is a wasteful number, since it uses less digits than its factorization.

643024049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33843390.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 643024049 is about 25357.9188617678. The cubic root of 643024049 is about 863.1290596478.

The spelling of 643024049 in words is "six hundred forty-three million, twenty-four thousand, forty-nine".