28717727 has 2 divisors, whose sum is σ = 28717728. Its totient is φ = 28717726.

The previous prime is 28717699. The next prime is 28717729. The reversal of 28717727 is 72771782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28717727 is a prime.

Together with 28717729, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28717729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14358863 + 14358864.

It is an arithmetic number, because the mean of its divisors is an integer number (14358864).

Almost surely, 2^28717727 is an apocalyptic number.

28717727 is a deficient number, since it is larger than the sum of its proper divisors (1).

28717727 is an equidigital number, since it uses as much as digits as its factorization.

28717727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76832, while the sum is 41.

The square root of 28717727 is about 5358.8923295771. The cubic root of 28717727 is about 306.2316122793.

The spelling of 28717727 in words is "twenty-eight million, seven hundred seventeen thousand, seven hundred twenty-seven".