28230581 has 2 divisors, whose sum is σ = 28230582. Its totient is φ = 28230580.

The previous prime is 28230569. The next prime is 28230607. The reversal of 28230581 is 18503282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 7890481 = 4510^2 + 2809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28230581 is a prime.

It is a super-2 number, since 2×28230581² = 1593931407195122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28230511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14115290 + 14115291.

It is an arithmetic number, because the mean of its divisors is an integer number (14115291).

Almost surely, 2^28230581 is an apocalyptic number.

It is an amenable number.

28230581 is a deficient number, since it is larger than the sum of its proper divisors (1).

28230581 is an equidigital number, since it uses as much as digits as its factorization.

28230581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28230581 is about 5313.2458064727. The cubic root of 28230581 is about 304.4901667891.

The spelling of 28230581 in words is "twenty-eight million, two hundred thirty thousand, five hundred eighty-one".