643264573 has 16 divisors (see below), whose sum is σ = 781073280. Its totient is φ = 517962816.

The previous prime is 643264571. The next prime is 643264579. The reversal of 643264573 is 375462346.

It is not a de Polignac number, because 643264573 - 2¹ = 643264571 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 (643264571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35311 + ... + 50332.

It is an arithmetic number, because the mean of its divisors is an integer number (48817080).

Almost surely, 2^643264573 is an apocalyptic number.

It is an amenable number.

643264573 is a deficient number, since it is larger than the sum of its proper divisors (137808707).

643264573 is a wasteful number, since it uses less digits than its factorization.

643264573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85716.

The product of its digits is 362880, while the sum is 40.

The square root of 643264573 is about 25362.6609999818. The cubic root of 643264573 is about 863.2366644229.

The spelling of 643264573 in words is "six hundred forty-three million, two hundred sixty-four thousand, five hundred seventy-three".