28459381 has 2 divisors, whose sum is σ = 28459382. Its totient is φ = 28459380.

The previous prime is 28459369. The next prime is 28459391. The reversal of 28459381 is 18395482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26946481 + 1512900 = 5191^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 28459381 - 2¹¹ = 28457333 is a prime.

It is a super-2 number, since 2×28459381² = 1619872733806322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28459331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14229690 + 14229691.

It is an arithmetic number, because the mean of its divisors is an integer number (14229691).

Almost surely, 2^28459381 is an apocalyptic number.

It is an amenable number.

28459381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28459381 is an equidigital number, since it uses as much as digits as its factorization.

28459381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 28459381 is about 5334.7334516356. The cubic root of 28459381 is about 305.3105535224.

The spelling of 28459381 in words is "twenty-eight million, four hundred fifty-nine thousand, three hundred eighty-one".