28595681 has 2 divisors, whose sum is σ = 28595682. Its totient is φ = 28595680.

The previous prime is 28595669. The next prime is 28595759. The reversal of 28595681 is 18659582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 11621281 = 4120^2 + 3409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28595681 is a prime.

It is a super-2 number, since 2×28595681² = 1635425943707522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28595621) 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, 14297840 + 14297841.

It is an arithmetic number, because the mean of its divisors is an integer number (14297841).

Almost surely, 2^28595681 is an apocalyptic number.

It is an amenable number.

28595681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28595681 is an equidigital number, since it uses as much as digits as its factorization.

28595681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 28595681 is about 5347.4929639972. The cubic root of 28595681 is about 305.7971835863.

The spelling of 28595681 in words is "twenty-eight million, five hundred ninety-five thousand, six hundred eighty-one".