28682981 has 2 divisors, whose sum is σ = 28682982. Its totient is φ = 28682980.

The previous prime is 28682971. The next prime is 28683041. The reversal of 28682981 is 18928682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 1288225 = 5234^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 28682981 - 2⁶ = 28682917 is a prime.

It is a super-2 number, since 2×28682981² = 1645426798092722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28682971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14341490 + 14341491.

It is an arithmetic number, because the mean of its divisors is an integer number (14341491).

Almost surely, 2^28682981 is an apocalyptic number.

It is an amenable number.

28682981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28682981 is an equidigital number, since it uses as much as digits as its factorization.

28682981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 28682981 is about 5355.6494470792. The cubic root of 28682981 is about 306.1080577261.

The spelling of 28682981 in words is "twenty-eight million, six hundred eighty-two thousand, nine hundred eighty-one".