28686019 has 8 divisors (see below), whose sum is σ = 29605968. Its totient is φ = 27776640.

The previous prime is 28686011. The next prime is 28686023. The reversal of 28686019 is 91068682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28686019 - 2³ = 28686011 is a prime.

It is a super-2 number, since 2×28686019² = 1645775372136722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28686011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3064 + ... + 8170.

It is an arithmetic number, because the mean of its divisors is an integer number (3700746).

Almost surely, 2^28686019 is an apocalyptic number.

28686019 is a deficient number, since it is larger than the sum of its proper divisors (919949).

28686019 is a wasteful number, since it uses less digits than its factorization.

28686019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28686019 is about 5355.9330653024. The cubic root of 28686019 is about 306.1188646392.

The spelling of 28686019 in words is "twenty-eight million, six hundred eighty-six thousand, nineteen".