643034407 has 8 divisors (see below), whose sum is σ = 645361200. Its totient is φ = 640713024.

The previous prime is 643034387. The next prime is 643034417. The reversal of 643034407 is 704430346.

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 643034407 - 2¹¹ = 643032359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643034417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498219 + ... + 499507.

It is an arithmetic number, because the mean of its divisors is an integer number (80670150).

Almost surely, 2^643034407 is an apocalyptic number.

643034407 is a deficient number, since it is larger than the sum of its proper divisors (2326793).

643034407 is a wasteful number, since it uses less digits than its factorization.

643034407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705.

The product of its (nonzero) digits is 24192, while the sum is 31.

The square root of 643034407 is about 25358.1230969486. The cubic root of 643034407 is about 863.1336941260.

The spelling of 643034407 in words is "six hundred forty-three million, thirty-four thousand, four hundred seven".