28266493 has 2 divisors, whose sum is σ = 28266494. Its totient is φ = 28266492.

The previous prime is 28266473. The next prime is 28266499. The reversal of 28266493 is 39466282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22781529 + 5484964 = 4773^2 + 2342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28266493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28266499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14133246 + 14133247.

It is an arithmetic number, because the mean of its divisors is an integer number (14133247).

Almost surely, 2^28266493 is an apocalyptic number.

It is an amenable number.

28266493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28266493 is an equidigital number, since it uses as much as digits as its factorization.

28266493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 28266493 is about 5316.6242109068. The cubic root of 28266493 is about 304.6192256209.

The spelling of 28266493 in words is "twenty-eight million, two hundred sixty-six thousand, four hundred ninety-three".