28078307 has 2 divisors, whose sum is σ = 28078308. Its totient is φ = 28078306.

The previous prime is 28078283. The next prime is 28078313. The reversal of 28078307 is 70387082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28078307 - 2⁶ = 28078243 is a prime.

It is not a weakly prime, because it can be changed into another prime (28078327) 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, 14039153 + 14039154.

It is an arithmetic number, because the mean of its divisors is an integer number (14039154).

Almost surely, 2^28078307 is an apocalyptic number.

28078307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078307 is an equidigital number, since it uses as much as digits as its factorization.

28078307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28078307 is about 5298.8967719706. The cubic root of 28078307 is about 303.9417124803.

It can be divided in two parts, 280 and 78307, that added together give a palindrome (78587).

The spelling of 28078307 in words is "twenty-eight million, seventy-eight thousand, three hundred seven".