28710109 has 2 divisors, whose sum is σ = 28710110. Its totient is φ = 28710108.

The previous prime is 28710107. The next prime is 28710151. The reversal of 28710109 is 90101782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26316900 + 2393209 = 5130^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 28710109 - 2¹ = 28710107 is a prime.

Together with 28710107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28710107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14355054 + 14355055.

It is an arithmetic number, because the mean of its divisors is an integer number (14355055).

Almost surely, 2^28710109 is an apocalyptic number.

It is an amenable number.

28710109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28710109 is an equidigital number, since it uses as much as digits as its factorization.

28710109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28710109 is about 5358.1815012185. The cubic root of 28710109 is about 306.2045316921.

The spelling of 28710109 in words is "twenty-eight million, seven hundred ten thousand, one hundred nine".