2728261 has 2 divisors, whose sum is σ = 2728262. Its totient is φ = 2728260.

The previous prime is 2728259. The next prime is 2728277. The reversal of 2728261 is 1628272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 136161 = 1610^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728261 - 2¹ = 2728259 is a prime.

Together with 2728259, it forms a pair of twin primes.

2728261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2728241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364130 + 1364131.

It is an arithmetic number, because the mean of its divisors is an integer number (1364131).

2^2728261 is an apocalyptic number.

It is an amenable number.

2728261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728261 is an equidigital number, since it uses as much as digits as its factorization.

2728261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 2728261 is about 1651.7448350154. The cubic root of 2728261 is about 139.7318165288.

The spelling of 2728261 in words is "two million, seven hundred twenty-eight thousand, two hundred sixty-one".