643268479 has 4 divisors (see below), whose sum is σ = 735163984. Its totient is φ = 551372976.

The previous prime is 643268477. The next prime is 643268489. The reversal of 643268479 is 974862346.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 643268479 - 2¹ = 643268477 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 (643268477) 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, 45947742 + ... + 45947755.

It is an arithmetic number, because the mean of its divisors is an integer number (183790996).

Almost surely, 2^643268479 is an apocalyptic number.

643268479 is a deficient number, since it is larger than the sum of its proper divisors (91895505).

643268479 is an equidigital number, since it uses as much as digits as its factorization.

643268479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91895504.

The product of its digits is 1741824, while the sum is 49.

The square root of 643268479 is about 25362.7380028261. The cubic root of 643268479 is about 863.2384116540.

The spelling of 643268479 in words is "six hundred forty-three million, two hundred sixty-eight thousand, four hundred seventy-nine".