28659091 has 2 divisors, whose sum is σ = 28659092. Its totient is φ = 28659090.

The previous prime is 28659089. The next prime is 28659109. The reversal of 28659091 is 19095682.

Together with next prime (28659109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28659091 - 2¹ = 28659089 is a prime.

Together with 28659089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28659031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14329545 + 14329546.

It is an arithmetic number, because the mean of its divisors is an integer number (14329546).

Almost surely, 2^28659091 is an apocalyptic number.

28659091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28659091 is an equidigital number, since it uses as much as digits as its factorization.

28659091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 28659091 is about 5353.4186273819. The cubic root of 28659091 is about 306.0230485152.

The spelling of 28659091 in words is "twenty-eight million, six hundred fifty-nine thousand, ninety-one".