28689847 has 2 divisors, whose sum is σ = 28689848. Its totient is φ = 28689846.

The previous prime is 28689839. The next prime is 28689851. The reversal of 28689847 is 74898682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28689847 - 2³ = 28689839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28689794 and 28689803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28689247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14344923 + 14344924.

It is an arithmetic number, because the mean of its divisors is an integer number (14344924).

Almost surely, 2^28689847 is an apocalyptic number.

28689847 is a deficient number, since it is larger than the sum of its proper divisors (1).

28689847 is an equidigital number, since it uses as much as digits as its factorization.

28689847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 52.

The square root of 28689847 is about 5356.2904140832. The cubic root of 28689847 is about 306.1324806902.

The spelling of 28689847 in words is "twenty-eight million, six hundred eighty-nine thousand, eight hundred forty-seven".