6809844479 has 4 divisors (see below), whose sum is σ = 7210423584. Its totient is φ = 6409265376.

The previous prime is 6809844469. The next prime is 6809844491. The reversal of 6809844479 is 9744489086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9744489086 = 2 ⋅4872244543.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6809844479 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 (6809844469) 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, 200289527 + ... + 200289560.

It is an arithmetic number, because the mean of its divisors is an integer number (1802605896).

Almost surely, 2^6809844479 is an apocalyptic number.

6809844479 is a deficient number, since it is larger than the sum of its proper divisors (400579105).

6809844479 is a wasteful number, since it uses less digits than its factorization.

6809844479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400579104.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The square root of 6809844479 is about 82521.7818457648. The cubic root of 6809844479 is about 1895.4502847366.

The spelling of 6809844479 in words is "six billion, eight hundred nine million, eight hundred forty-four thousand, four hundred seventy-nine".