28340863 has 4 divisors (see below), whose sum is σ = 28729168. Its totient is φ = 27952560.

The previous prime is 28340861. The next prime is 28340911. The reversal of 28340863 is 36804382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36804382 = 2 ⋅18402191.

It is a cyclic number.

It is not a de Polignac number, because 28340863 - 2¹ = 28340861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28340861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194043 + ... + 194188.

It is an arithmetic number, because the mean of its divisors is an integer number (7182292).

Almost surely, 2^28340863 is an apocalyptic number.

28340863 is a deficient number, since it is larger than the sum of its proper divisors (388305).

28340863 is an equidigital number, since it uses as much as digits as its factorization.

28340863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388304.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28340863 is about 5323.6137162645. The cubic root of 28340863 is about 304.8861458050.

The spelling of 28340863 in words is "twenty-eight million, three hundred forty thousand, eight hundred sixty-three".