28078807 has 2 divisors, whose sum is σ = 28078808. Its totient is φ = 28078806.

The previous prime is 28078783. The next prime is 28078847. The reversal of 28078807 is 70887082.

It is an a-pointer prime, because the next prime (28078847) can be obtained adding 28078807 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28078807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28078807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28078847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039403 + 14039404.

It is an arithmetic number, because the mean of its divisors is an integer number (14039404).

Almost surely, 2^28078807 is an apocalyptic number.

28078807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078807 is an equidigital number, since it uses as much as digits as its factorization.

28078807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 28078807 is about 5298.9439513926. The cubic root of 28078807 is about 303.9435166009.

The spelling of 28078807 in words is "twenty-eight million, seventy-eight thousand, eight hundred seven".