2728623661 has 2 divisors, whose sum is σ = 2728623662. Its totient is φ = 2728623660.

The previous prime is 2728623613. The next prime is 2728623671. The reversal of 2728623661 is 1663268272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2725362025 + 3261636 = 52205^2 + 1806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728623661 - 2⁷ = 2728623533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2728623671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364311830 + 1364311831.

It is an arithmetic number, because the mean of its divisors is an integer number (1364311831).

Almost surely, 2^2728623661 is an apocalyptic number.

It is an amenable number.

2728623661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728623661 is an equidigital number, since it uses as much as digits as its factorization.

2728623661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 43.

The square root of 2728623661 is about 52236.2293911036. The cubic root of 2728623661 is about 1397.3800765626.

The spelling of 2728623661 in words is "two billion, seven hundred twenty-eight million, six hundred twenty-three thousand, six hundred sixty-one".