28157711 has 2 divisors, whose sum is σ = 28157712. Its totient is φ = 28157710.

The previous prime is 28157707. The next prime is 28157719. The reversal of 28157711 is 11775182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28157711 - 2² = 28157707 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28157719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078855 + 14078856.

It is an arithmetic number, because the mean of its divisors is an integer number (14078856).

Almost surely, 2^28157711 is an apocalyptic number.

28157711 is a deficient number, since it is larger than the sum of its proper divisors (1).

28157711 is an equidigital number, since it uses as much as digits as its factorization.

28157711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 32.

The square root of 28157711 is about 5306.3839853520. The cubic root of 28157711 is about 304.2279533059.

The spelling of 28157711 in words is "twenty-eight million, one hundred fifty-seven thousand, seven hundred eleven".