2728748381 has 2 divisors, whose sum is σ = 2728748382. Its totient is φ = 2728748380.

The previous prime is 2728748377. The next prime is 2728748383. The reversal of 2728748381 is 1838478272.

2728748381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2378122756 + 350625625 = 48766^2 + 18725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728748381 - 2² = 2728748377 is a prime.

It is a super-2 number, since 2×2728748381² = 14892135453620242322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2728748383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2728748383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364374190 + 1364374191.

It is an arithmetic number, because the mean of its divisors is an integer number (1364374191).

Almost surely, 2^2728748381 is an apocalyptic number.

It is an amenable number.

2728748381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728748381 is an equidigital number, since it uses as much as digits as its factorization.

2728748381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1204224, while the sum is 50.

The square root of 2728748381 is about 52237.4231849160. The cubic root of 2728748381 is about 1397.4013667330.

The spelling of 2728748381 in words is "two billion, seven hundred twenty-eight million, seven hundred forty-eight thousand, three hundred eighty-one".