28252261 has 2 divisors, whose sum is σ = 28252262. Its totient is φ = 28252260.

The previous prime is 28252243. The next prime is 28252363. The reversal of 28252261 is 16225282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15249025 + 13003236 = 3905^2 + 3606^2 .

It is a cyclic number.

It is not a de Polignac number, because 28252261 - 2¹¹ = 28250213 is a prime.

It is a super-2 number, since 2×28252261² = 1596380503224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28252561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126130 + 14126131.

It is an arithmetic number, because the mean of its divisors is an integer number (14126131).

Almost surely, 2^28252261 is an apocalyptic number.

It is an amenable number.

28252261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28252261 is an equidigital number, since it uses as much as digits as its factorization.

28252261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 28252261 is about 5315.2855991000. The cubic root of 28252261 is about 304.5680924220.

The spelling of 28252261 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred sixty-one".