643575447 has 24 divisors (see below), whose sum is σ = 961770576. Its totient is φ = 414377856.

The previous prime is 643575431. The next prime is 643575451. The reversal of 643575447 is 744575346.

It is not a de Polignac number, because 643575447 - 2⁴ = 643575431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643575487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38568 + ... + 52674.

It is an arithmetic number, because the mean of its divisors is an integer number (40073774).

Almost surely, 2^643575447 is an apocalyptic number.

643575447 is a deficient number, since it is larger than the sum of its proper divisors (318195129).

643575447 is a wasteful number, since it uses less digits than its factorization.

643575447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14287 (or 14284 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 45.

The square root of 643575447 is about 25368.7888358905. The cubic root of 643575447 is about 863.3757024006.

The spelling of 643575447 in words is "six hundred forty-three million, five hundred seventy-five thousand, four hundred forty-seven".