28085986 has 8 divisors (see below), whose sum is σ = 42819804. Its totient is φ = 13812720.

The previous prime is 28085963. The next prime is 28085987. The reversal of 28085986 is 68958082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26842761 + 1243225 = 5181^2 + 1115^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28085987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114985 + ... + 115228.

Almost surely, 2^28085986 is an apocalyptic number.

28085986 is a deficient number, since it is larger than the sum of its proper divisors (14733818).

28085986 is a wasteful number, since it uses less digits than its factorization.

28085986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230276.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 28085986 is about 5299.6213072256. The cubic root of 28085986 is about 303.9694178031.

The spelling of 28085986 in words is "twenty-eight million, eighty-five thousand, nine hundred eighty-six".