28705711 has 2 divisors, whose sum is σ = 28705712. Its totient is φ = 28705710.

The previous prime is 28705709. The next prime is 28705727. The reversal of 28705711 is 11750782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28705711 - 2¹ = 28705709 is a prime.

Together with 28705709, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28705111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352855 + 14352856.

It is an arithmetic number, because the mean of its divisors is an integer number (14352856).

Almost surely, 2^28705711 is an apocalyptic number.

28705711 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705711 is an equidigital number, since it uses as much as digits as its factorization.

28705711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 28705711 is about 5357.7710850689. The cubic root of 28705711 is about 306.1888954307.

The spelling of 28705711 in words is "twenty-eight million, seven hundred five thousand, seven hundred eleven".