6728333881 has 2 divisors, whose sum is σ = 6728333882. Its totient is φ = 6728333880.

The previous prime is 6728333839. The next prime is 6728333893. The reversal of 6728333881 is 1883338276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4613805625 + 2114528256 = 67925^2 + 45984^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728333881 - 2¹¹ = 6728331833 is a prime.

It is a super-2 number, since 2×6728333881² = 90540953628425044322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6728331881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3364166940 + 3364166941.

It is an arithmetic number, because the mean of its divisors is an integer number (3364166941).

Almost surely, 2^6728333881 is an apocalyptic number.

It is an amenable number.

6728333881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728333881 is an equidigital number, since it uses as much as digits as its factorization.

6728333881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 6728333881 is about 82026.4218468659. The cubic root of 6728333881 is about 1887.8573631267.

The spelling of 6728333881 in words is "six billion, seven hundred twenty-eight million, three hundred thirty-three thousand, eight hundred eighty-one".