27985789 has 4 divisors (see below), whose sum is σ = 30138556. Its totient is φ = 25833024.

The previous prime is 27985759. The next prime is 27985807. The reversal of 27985789 is 98758972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13032100 + 14953689 = 3610^2 + 3867^2 .

It is a cyclic number.

It is not a de Polignac number, because 27985789 - 2²³ = 19597181 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 (27985709) 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, 1076364 + ... + 1076389.

It is an arithmetic number, because the mean of its divisors is an integer number (7534639).

Almost surely, 2^27985789 is an apocalyptic number.

It is an amenable number.

27985789 is a deficient number, since it is larger than the sum of its proper divisors (2152767).

27985789 is a wasteful number, since it uses less digits than its factorization.

27985789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152766.

The product of its digits is 2540160, while the sum is 55.

The square root of 27985789 is about 5290.1596384230. The cubic root of 27985789 is about 303.6075159155.

It can be divided in two parts, 279 and 85789, that added together give a palindrome (86068).

The spelling of 27985789 in words is "twenty-seven million, nine hundred eighty-five thousand, seven hundred eighty-nine".