28651387 has 2 divisors, whose sum is σ = 28651388. Its totient is φ = 28651386.

The previous prime is 28651379. The next prime is 28651393. The reversal of 28651387 is 78315682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28651387 - 2³ = 28651379 is a prime.

It is equal to p_1779448 and since 28651387 and 1779448 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28651367) 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, 14325693 + 14325694.

It is an arithmetic number, because the mean of its divisors is an integer number (14325694).

Almost surely, 2^28651387 is an apocalyptic number.

28651387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28651387 is an equidigital number, since it uses as much as digits as its factorization.

28651387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28651387 is about 5352.6990388028. The cubic root of 28651387 is about 305.9956248395.

The spelling of 28651387 in words is "twenty-eight million, six hundred fifty-one thousand, three hundred eighty-seven".