28782493 has 2 divisors, whose sum is σ = 28782494. Its totient is φ = 28782492.

The previous prime is 28782487. The next prime is 28782497. The reversal of 28782493 is 39428782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 13704804 = 3883^2 + 3702^2 .

It is a cyclic number.

It is not a de Polignac number, because 28782493 - 2⁵ = 28782461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28782497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14391246 + 14391247.

It is an arithmetic number, because the mean of its divisors is an integer number (14391247).

Almost surely, 2^28782493 is an apocalyptic number.

It is an amenable number.

28782493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28782493 is an equidigital number, since it uses as much as digits as its factorization.

28782493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 28782493 is about 5364.9317796222. The cubic root of 28782493 is about 306.4616502789.

The spelling of 28782493 in words is "twenty-eight million, seven hundred eighty-two thousand, four hundred ninety-three".