28857911 has 2 divisors, whose sum is σ = 28857912. Its totient is φ = 28857910.

The previous prime is 28857889. The next prime is 28857919. The reversal of 28857911 is 11975882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28857911 - 2¹⁰ = 28856887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28857919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428955 + 14428956.

It is an arithmetic number, because the mean of its divisors is an integer number (14428956).

Almost surely, 2^28857911 is an apocalyptic number.

28857911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857911 is an equidigital number, since it uses as much as digits as its factorization.

28857911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 28857911 is about 5371.9559752477. The cubic root of 28857911 is about 306.7290879288.

The spelling of 28857911 in words is "twenty-eight million, eight hundred fifty-seven thousand, nine hundred eleven".