28679281 has 2 divisors, whose sum is σ = 28679282. Its totient is φ = 28679280.

The previous prime is 28679249. The next prime is 28679297. The reversal of 28679281 is 18297682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26832400 + 1846881 = 5180^2 + 1359^2 .

It is a cyclic number.

It is not a de Polignac number, because 28679281 - 2⁵ = 28679249 is a prime.

It is a super-2 number, since 2×28679281² = 1645002317353922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28619281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14339640 + 14339641.

It is an arithmetic number, because the mean of its divisors is an integer number (14339641).

Almost surely, 2^28679281 is an apocalyptic number.

It is an amenable number.

28679281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28679281 is an equidigital number, since it uses as much as digits as its factorization.

28679281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 28679281 is about 5355.3040063100. The cubic root of 28679281 is about 306.0948948856.

The spelling of 28679281 in words is "twenty-eight million, six hundred seventy-nine thousand, two hundred eighty-one".