6873238721 has 4 divisors (see below), whose sum is σ = 6874415700. Its totient is φ = 6872061744.

The previous prime is 6873238693. The next prime is 6873238727. The reversal of 6873238721 is 1278323786.

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 3913878721 + 2959360000 = 62561^2 + 54400^2 .

It is a cyclic number.

It is not a de Polignac number, because 6873238721 - 2¹⁴ = 6873222337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6873238727) 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, 579686 + ... + 591423.

It is an arithmetic number, because the mean of its divisors is an integer number (1718603925).

Almost surely, 2^6873238721 is an apocalyptic number.

It is an amenable number.

6873238721 is a deficient number, since it is larger than the sum of its proper divisors (1176979).

6873238721 is a wasteful number, since it uses less digits than its factorization.

6873238721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176978.

The product of its digits is 677376, while the sum is 47.

The square root of 6873238721 is about 82904.9981665762. The cubic root of 6873238721 is about 1901.3138392929.

The spelling of 6873238721 in words is "six billion, eight hundred seventy-three million, two hundred thirty-eight thousand, seven hundred twenty-one".