28859981 has 2 divisors, whose sum is σ = 28859982. Its totient is φ = 28859980.

The previous prime is 28859953. The next prime is 28860001. The reversal of 28859981 is 18995882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24344356 + 4515625 = 4934^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 28859981 - 2¹⁴ = 28843597 is a prime.

It is a super-2 number, since 2×28859981² = 1665797006640722, 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 (28859911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14429990 + 14429991.

It is an arithmetic number, because the mean of its divisors is an integer number (14429991).

Almost surely, 2^28859981 is an apocalyptic number.

It is an amenable number.

28859981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28859981 is an equidigital number, since it uses as much as digits as its factorization.

28859981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 50.

The square root of 28859981 is about 5372.1486390456. The cubic root of 28859981 is about 306.7364217241.

The spelling of 28859981 in words is "twenty-eight million, eight hundred fifty-nine thousand, nine hundred eighty-one".