28048561 has 2 divisors, whose sum is σ = 28048562. Its totient is φ = 28048560.

The previous prime is 28048549. The next prime is 28048567. The reversal of 28048561 is 16584082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 1577536 = 5145^2 + 1256^2 .

It is a cyclic number.

It is not a de Polignac number, because 28048561 - 2⁵ = 28048529 is a prime.

It is not a weakly prime, because it can be changed into another prime (28048567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14024280 + 14024281.

It is an arithmetic number, because the mean of its divisors is an integer number (14024281).

Almost surely, 2^28048561 is an apocalyptic number.

It is an amenable number.

28048561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28048561 is an equidigital number, since it uses as much as digits as its factorization.

28048561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 28048561 is about 5296.0892175265. The cubic root of 28048561 is about 303.8343431775.

It can be divided in two parts, 280 and 48561, that added together give a square (48841 = 221²).

The spelling of 28048561 in words is "twenty-eight million, forty-eight thousand, five hundred sixty-one".