28078907 has 2 divisors, whose sum is σ = 28078908. Its totient is φ = 28078906.

The previous prime is 28078861. The next prime is 28078937. The reversal of 28078907 is 70987082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28078907 - 2¹² = 28074811 is a prime.

It is not a weakly prime, because it can be changed into another prime (28078937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039453 + 14039454.

It is an arithmetic number, because the mean of its divisors is an integer number (14039454).

Almost surely, 2^28078907 is an apocalyptic number.

28078907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078907 is an equidigital number, since it uses as much as digits as its factorization.

28078907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 28078907 is about 5298.9533872266. The cubic root of 28078907 is about 303.9438774224.

The spelling of 28078907 in words is "twenty-eight million, seventy-eight thousand, nine hundred seven".