27985791 has 16 divisors (see below), whose sum is σ = 40055904. Its totient is φ = 17316864.

The previous prime is 27985759. The next prime is 27985807. The reversal of 27985791 is 19758972.

It is not a de Polignac number, because 27985791 - 2⁵ = 27985759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27985791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27985751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36 + ... + 7481.

It is an arithmetic number, because the mean of its divisors is an integer number (2503494).

Almost surely, 2^27985791 is an apocalyptic number.

27985791 is a deficient number, since it is larger than the sum of its proper divisors (12070113).

27985791 is a wasteful number, since it uses less digits than its factorization.

27985791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610.

The product of its digits is 317520, while the sum is 48.

The square root of 27985791 is about 5290.1598274532. The cubic root of 27985791 is about 303.6075231480.

The spelling of 27985791 in words is "twenty-seven million, nine hundred eighty-five thousand, seven hundred ninety-one".