643348445 has 8 divisors (see below), whose sum is σ = 772155744. Its totient is φ = 514587024.

The previous prime is 643348439. The next prime is 643348451. The reversal of 643348445 is 544843346.

It is an interprime number because it is at equal distance from previous prime (643348439) and next prime (643348451).

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 643348445 - 2²⁴ = 626571229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42362 + ... + 55508.

It is an arithmetic number, because the mean of its divisors is an integer number (96519468).

Almost surely, 2^643348445 is an apocalyptic number.

It is an amenable number.

643348445 is a deficient number, since it is larger than the sum of its proper divisors (128807299).

643348445 is a wasteful number, since it uses less digits than its factorization.

643348445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22939.

The product of its digits is 552960, while the sum is 41.

The square root of 643348445 is about 25364.3144003539. The cubic root of 643348445 is about 863.2741804736.

The spelling of 643348445 in words is "six hundred forty-three million, three hundred forty-eight thousand, four hundred forty-five".