643456793 has 8 divisors (see below), whose sum is σ = 774083520. Its totient is φ = 522506160.

The previous prime is 643456769. The next prime is 643456819. The reversal of 643456793 is 397654346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643456793 - 2¹² = 643452697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643456703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418878 + ... + 2419143.

It is an arithmetic number, because the mean of its divisors is an integer number (96760440).

Almost surely, 2^643456793 is an apocalyptic number.

It is an amenable number.

643456793 is a deficient number, since it is larger than the sum of its proper divisors (130626727).

643456793 is a wasteful number, since it uses less digits than its factorization.

643456793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838047.

The product of its digits is 1632960, while the sum is 47.

The square root of 643456793 is about 25366.4501458127. The cubic root of 643456793 is about 863.3226398434.

The spelling of 643456793 in words is "six hundred forty-three million, four hundred fifty-six thousand, seven hundred ninety-three".