28363381 has 2 divisors, whose sum is σ = 28363382. Its totient is φ = 28363380.

The previous prime is 28363343. The next prime is 28363397. The reversal of 28363381 is 18336382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28196100 + 167281 = 5310^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 28363381 - 2¹⁹ = 27839093 is a prime.

It is a super-2 number, since 2×28363381² = 1608962763502322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28363331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14181690 + 14181691.

It is an arithmetic number, because the mean of its divisors is an integer number (14181691).

Almost surely, 2^28363381 is an apocalyptic number.

It is an amenable number.

28363381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28363381 is an equidigital number, since it uses as much as digits as its factorization.

28363381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 28363381 is about 5325.7282131179. The cubic root of 28363381 is about 304.9668726898.

The spelling of 28363381 in words is "twenty-eight million, three hundred sixty-three thousand, three hundred eighty-one".