2756728657 has 2 divisors, whose sum is σ = 2756728658. Its totient is φ = 2756728656.

The previous prime is 2756728613. The next prime is 2756728669. The reversal of 2756728657 is 7568276572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2277293841 + 479434816 = 47721^2 + 21896^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756728657 - 2⁷ = 2756728529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2756728598 and 2756728607.

It is not a weakly prime, because it can be changed into another prime (2756728757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378364328 + 1378364329.

It is an arithmetic number, because the mean of its divisors is an integer number (1378364329).

Almost surely, 2^2756728657 is an apocalyptic number.

It is an amenable number.

2756728657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756728657 is an equidigital number, since it uses as much as digits as its factorization.

2756728657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9878400, while the sum is 55.

The square root of 2756728657 is about 52504.5584401964. The cubic root of 2756728657 is about 1402.1613989781.

The spelling of 2756728657 in words is "two billion, seven hundred fifty-six million, seven hundred twenty-eight thousand, six hundred fifty-seven".