28838981 has 2 divisors, whose sum is σ = 28838982. Its totient is φ = 28838980.

The previous prime is 28838977. The next prime is 28838989. The reversal of 28838981 is 18983882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 11282881 = 4190^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 28838981 - 2² = 28838977 is a prime.

It is a super-2 number, since 2×28838981² = 1663373650236722, 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 (28838989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14419490 + 14419491.

It is an arithmetic number, because the mean of its divisors is an integer number (14419491).

Almost surely, 2^28838981 is an apocalyptic number.

It is an amenable number.

28838981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28838981 is an equidigital number, since it uses as much as digits as its factorization.

28838981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 47.

The square root of 28838981 is about 5370.1937581432. The cubic root of 28838981 is about 306.6620046288.

The spelling of 28838981 in words is "twenty-eight million, eight hundred thirty-eight thousand, nine hundred eighty-one".