28705727 has 2 divisors, whose sum is σ = 28705728. Its totient is φ = 28705726.

The previous prime is 28705711. The next prime is 28705759. The reversal of 28705727 is 72750782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28705727 - 2⁴ = 28705711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28705427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352863 + 14352864.

It is an arithmetic number, because the mean of its divisors is an integer number (14352864).

Almost surely, 2^28705727 is an apocalyptic number.

28705727 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705727 is an equidigital number, since it uses as much as digits as its factorization.

28705727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 28705727 is about 5357.7725782269. The cubic root of 28705727 is about 306.1889523186.

The spelling of 28705727 in words is "twenty-eight million, seven hundred five thousand, seven hundred twenty-seven".