27985806 has 24 divisors (see below), whose sum is σ = 61176960. Its totient is φ = 9245376.

The previous prime is 27985759. The next prime is 27985807. The reversal of 27985806 is 60858972.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27985807) 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 11 ways as a sum of consecutive naturals, for example, 4846 + ... + 8913.

It is an arithmetic number, because the mean of its divisors is an integer number (2549040).

Almost surely, 2^27985806 is an apocalyptic number.

27985806 is an abundant number, since it is smaller than the sum of its proper divisors (33191154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27985806 is a wasteful number, since it uses less digits than its factorization.

27985806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880 (or 13877 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 27985806 is about 5290.1612451796. The cubic root of 27985806 is about 303.6075773911.

The spelling of 27985806 in words is "twenty-seven million, nine hundred eighty-five thousand, eight hundred six".