6728234789 has 4 divisors (see below), whose sum is σ = 7124013324. Its totient is φ = 6332456256.

The previous prime is 6728234783. The next prime is 6728234797. The reversal of 6728234789 is 9874328276.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5414752225 + 1313482564 = 73585^2 + 36242^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728234789 - 2¹² = 6728230693 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 (6728234783) 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, 197889242 + ... + 197889275.

It is an arithmetic number, because the mean of its divisors is an integer number (1781003331).

Almost surely, 2^6728234789 is an apocalyptic number.

It is an amenable number.

6728234789 is a deficient number, since it is larger than the sum of its proper divisors (395778535).

6728234789 is a wasteful number, since it uses less digits than its factorization.

6728234789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395778534.

The product of its digits is 8128512, while the sum is 56.

The square root of 6728234789 is about 82025.8178197572. The cubic root of 6728234789 is about 1887.8480952315.

The spelling of 6728234789 in words is "six billion, seven hundred twenty-eight million, two hundred thirty-four thousand, seven hundred eighty-nine".