2728549 has 2 divisors, whose sum is σ = 2728550. Its totient is φ = 2728548.

The previous prime is 2728547. The next prime is 2728553. The reversal of 2728549 is 9458272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 611524 = 1455^2 + 782^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728549 - 2¹ = 2728547 is a prime.

Together with 2728547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2728541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364274 + 1364275.

It is an arithmetic number, because the mean of its divisors is an integer number (1364275).

2^2728549 is an apocalyptic number.

It is an amenable number.

2728549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728549 is an equidigital number, since it uses as much as digits as its factorization.

2728549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 2728549 is about 1651.8320132507. The cubic root of 2728549 is about 139.7367331340.

The spelling of 2728549 in words is "two million, seven hundred twenty-eight thousand, five hundred forty-nine".