6728881 has 2 divisors, whose sum is σ = 6728882. Its totient is φ = 6728880.

The previous prime is 6728873. The next prime is 6728947. The reversal of 6728881 is 1888276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 46656 = 2585^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728881 - 2³ = 6728873 is a prime.

It is a super-2 number, since 2×6728881² = 90555679024322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6728801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3364440 + 3364441.

It is an arithmetic number, because the mean of its divisors is an integer number (3364441).

Almost surely, 2^6728881 is an apocalyptic number.

It is an amenable number.

6728881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728881 is an equidigital number, since it uses as much as digits as its factorization.

6728881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 6728881 is about 2594.0086738483. The cubic root of 6728881 is about 188.7908532537.

The spelling of 6728881 in words is "six million, seven hundred twenty-eight thousand, eight hundred eighty-one".