28718897 has 2 divisors, whose sum is σ = 28718898. Its totient is φ = 28718896.

The previous prime is 28718873. The next prime is 28718909. The reversal of 28718897 is 79881782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 16 = 5359^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 28718897 - 2²² = 24524593 is a prime.

It is not a weakly prime, because it can be changed into another prime (28718827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14359448 + 14359449.

It is an arithmetic number, because the mean of its divisors is an integer number (14359449).

Almost surely, 2^28718897 is an apocalyptic number.

It is an amenable number.

28718897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28718897 is an equidigital number, since it uses as much as digits as its factorization.

28718897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 50.

The square root of 28718897 is about 5359.0014928156. The cubic root of 28718897 is about 306.2357709896.

The spelling of 28718897 in words is "twenty-eight million, seven hundred eighteen thousand, eight hundred ninety-seven".