643484473 has 4 divisors (see below), whose sum is σ = 657175680. Its totient is φ = 629793268.

The previous prime is 643484461. The next prime is 643484477. The reversal of 643484473 is 374484346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643484473 - 2⁹ = 643483961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643484477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6845533 + ... + 6845626.

It is an arithmetic number, because the mean of its divisors is an integer number (164293920).

Almost surely, 2^643484473 is an apocalyptic number.

It is an amenable number.

643484473 is a deficient number, since it is larger than the sum of its proper divisors (13691207).

643484473 is a wasteful number, since it uses less digits than its factorization.

643484473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13691206.

The product of its digits is 774144, while the sum is 43.

The square root of 643484473 is about 25366.9957424997. The cubic root of 643484473 is about 863.3350190367.

The spelling of 643484473 in words is "six hundred forty-three million, four hundred eighty-four thousand, four hundred seventy-three".